CVE-2026-74974 (GCVE-0-2026-74974)
Vulnerability from cvelistv5 – Published: 2026-08-18 12:23 – Updated: 2026-08-18 19:24
VLAI
EPSS
VEX
Title
Same-origin policy bypass in the Graphics: ImageLib component
Summary
Same-origin policy bypass in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-18 19:24 UTC
CWE
- CWE-346 - Origin Validation Error
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Mozilla | Firefox |
Unaffected:
115.39 , ≤ 115.*
(rpm)
Unaffected: 140.14 , ≤ 140.* (rpm) Unaffected: 153.1 , ≤ 153.* (rpm) Unaffected: 154 , ≤ * (rpm) |
guessed | |
| Mozilla | Thunderbird |
Unaffected:
140.14 , ≤ 140.*
(rpm)
Unaffected: 153.1 , ≤ 153.* (rpm) Unaffected: 154 , ≤ * (rpm) |
guessed |
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.4,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-74974",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-18T19:24:45.790706Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-346",
"description": "CWE-346 Origin Validation Error",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-18T19:24:49.403Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "Firefox",
"vendor": "Mozilla",
"versions": [
{
"lessThanOrEqual": "115.*",
"status": "unaffected",
"version": "115.39",
"versionType": "rpm"
},
{
"lessThanOrEqual": "140.*",
"status": "unaffected",
"version": "140.14",
"versionType": "rpm"
},
{
"lessThanOrEqual": "153.*",
"status": "unaffected",
"version": "153.1",
"versionType": "rpm"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "154",
"versionType": "rpm"
}
]
},
{
"product": "Thunderbird",
"vendor": "Mozilla",
"versions": [
{
"lessThanOrEqual": "140.*",
"status": "unaffected",
"version": "140.14",
"versionType": "rpm"
},
{
"lessThanOrEqual": "153.*",
"status": "unaffected",
"version": "153.1",
"versionType": "rpm"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "154",
"versionType": "rpm"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "The Mozilla Fuzzing Team"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "Same-origin policy bypass in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1."
}
],
"value": "Same-origin policy bypass in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-18T18:55:21.289Z",
"orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
"shortName": "mozilla"
},
"references": [
{
"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2061794"
},
{
"url": "https://www.mozilla.org/security/advisories/mfsa2026-74/"
},
{
"url": "https://www.mozilla.org/security/advisories/mfsa2026-75/"
},
{
"url": "https://www.mozilla.org/security/advisories/mfsa2026-76/"
},
{
"url": "https://www.mozilla.org/security/advisories/mfsa2026-77/"
},
{
"url": "https://www.mozilla.org/security/advisories/mfsa2026-78/"
},
{
"url": "https://www.mozilla.org/security/advisories/mfsa2026-79/"
},
{
"url": "https://www.mozilla.org/security/advisories/mfsa2026-80/"
}
],
"title": "Same-origin policy bypass in the Graphics: ImageLib component"
}
},
"cveMetadata": {
"assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
"assignerShortName": "mozilla",
"cveId": "CVE-2026-74974",
"datePublished": "2026-08-18T12:23:34.067Z",
"dateReserved": "2026-08-17T11:58:52.693Z",
"dateUpdated": "2026-08-18T19:24:49.403Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-74974",
"date": "2026-08-19",
"epss": "0.00151",
"percentile": "0.04811"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-74974\",\"sourceIdentifier\":\"security@mozilla.org\",\"published\":\"2026-08-18T13:17:35.160\",\"lastModified\":\"2026-08-19T17:05:24.000\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Same-origin policy bypass in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.\"}],\"affected\":[{\"source\":\"security@mozilla.org\",\"affectedData\":[{\"vendor\":\"Mozilla\",\"product\":\"Firefox\",\"versions\":[{\"version\":\"115.39\",\"lessThanOrEqual\":\"115.*\",\"versionType\":\"rpm\",\"status\":\"unaffected\"},{\"version\":\"140.14\",\"lessThanOrEqual\":\"140.*\",\"versionType\":\"rpm\",\"status\":\"unaffected\"},{\"version\":\"153.1\",\"lessThanOrEqual\":\"153.*\",\"versionType\":\"rpm\",\"status\":\"unaffected\"},{\"version\":\"154\",\"lessThanOrEqual\":\"*\",\"versionType\":\"rpm\",\"status\":\"unaffected\"}]},{\"vendor\":\"Mozilla\",\"product\":\"Thunderbird\",\"versions\":[{\"version\":\"140.14\",\"lessThanOrEqual\":\"140.*\",\"versionType\":\"rpm\",\"status\":\"unaffected\"},{\"version\":\"153.1\",\"lessThanOrEqual\":\"153.*\",\"versionType\":\"rpm\",\"status\":\"unaffected\"},{\"version\":\"154\",\"lessThanOrEqual\":\"*\",\"versionType\":\"rpm\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N\",\"baseScore\":5.4,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.8,\"impactScore\":2.5}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-08-18T19:24:45.790706Z\",\"id\":\"CVE-2026-74974\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-346\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"115.39.0\",\"matchCriteriaId\":\"FD8DBFC4-10A7-41E2-B754-71CC6FEEBB5C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"116.0\",\"versionEndExcluding\":\"140.14.0\",\"matchCriteriaId\":\"502016C0-F897-4F18-BFC7-301B71D93E4D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"141.0\",\"versionEndExcluding\":\"153.1.0\",\"matchCriteriaId\":\"5D58C9D3-E300-408A-ABF2-6E2BB49AB921\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"140.14.0\",\"matchCriteriaId\":\"4E2EC2AA-23B2-45C9-8594-DF80A0D800A7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"141.0\",\"versionEndExcluding\":\"153.1.0\",\"matchCriteriaId\":\"47206424-A249-46CE-9776-F45A49344204\"}]}]}],\"references\":[{\"url\":\"https://bugzilla.mozilla.org/show_bug.cgi?id=2061794\",\"source\":\"security@mozilla.org\",\"tags\":[\"Permissions Required\"]},{\"url\":\"https://www.mozilla.org/security/advisories/mfsa2026-74/\",\"source\":\"security@mozilla.org\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://www.mozilla.org/security/advisories/mfsa2026-75/\",\"source\":\"security@mozilla.org\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://www.mozilla.org/security/advisories/mfsa2026-76/\",\"source\":\"security@mozilla.org\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://www.mozilla.org/security/advisories/mfsa2026-77/\",\"source\":\"security@mozilla.org\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://www.mozilla.org/security/advisories/mfsa2026-78/\",\"source\":\"security@mozilla.org\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://www.mozilla.org/security/advisories/mfsa2026-79/\",\"source\":\"security@mozilla.org\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://www.mozilla.org/security/advisories/mfsa2026-80/\",\"source\":\"security@mozilla.org\",\"tags\":[\"Vendor Advisory\"]}]}}",
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-18T20:57:58+00:00",
"cve": "CVE-2026-74974",
"id": "CVE-2026-74974",
"initial_release_date": "2026-08-18T12:23:34.067000+00:00",
"product_status:known_affected": "23",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "firefox: thunderbird: Same-origin policy bypass in the Graphics: ImageLib component",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74974.json",
"version": "3"
},
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.4, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N\", \"integrityImpact\": \"LOW\", \"userInteraction\": \"REQUIRED\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"LOW\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-74974\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-08-18T19:24:45.790706Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-346\", \"description\": \"CWE-346 Origin Validation Error\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-08-18T19:24:43.419Z\"}}], \"cna\": {\"title\": \"Same-origin policy bypass in the Graphics: ImageLib component\", \"credits\": [{\"lang\": \"en\", \"value\": \"The Mozilla Fuzzing Team\"}], \"affected\": [{\"vendor\": \"Mozilla\", \"product\": \"Firefox\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"115.39\", \"versionType\": \"rpm\", \"lessThanOrEqual\": \"115.*\"}, {\"status\": \"unaffected\", \"version\": \"140.14\", \"versionType\": \"rpm\", \"lessThanOrEqual\": \"140.*\"}, {\"status\": \"unaffected\", \"version\": \"153.1\", \"versionType\": \"rpm\", \"lessThanOrEqual\": \"153.*\"}, {\"status\": \"unaffected\", \"version\": \"154\", \"versionType\": \"rpm\", \"lessThanOrEqual\": \"*\"}]}, {\"vendor\": \"Mozilla\", \"product\": \"Thunderbird\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"140.14\", \"versionType\": \"rpm\", \"lessThanOrEqual\": \"140.*\"}, {\"status\": \"unaffected\", \"version\": \"153.1\", \"versionType\": \"rpm\", \"lessThanOrEqual\": \"153.*\"}, {\"status\": \"unaffected\", \"version\": \"154\", \"versionType\": \"rpm\", \"lessThanOrEqual\": \"*\"}]}], \"references\": [{\"url\": \"https://bugzilla.mozilla.org/show_bug.cgi?id=2061794\"}, {\"url\": \"https://www.mozilla.org/security/advisories/mfsa2026-74/\"}, {\"url\": \"https://www.mozilla.org/security/advisories/mfsa2026-75/\"}, {\"url\": \"https://www.mozilla.org/security/advisories/mfsa2026-76/\"}, {\"url\": \"https://www.mozilla.org/security/advisories/mfsa2026-77/\"}, {\"url\": \"https://www.mozilla.org/security/advisories/mfsa2026-78/\"}, {\"url\": \"https://www.mozilla.org/security/advisories/mfsa2026-79/\"}, {\"url\": \"https://www.mozilla.org/security/advisories/mfsa2026-80/\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Same-origin policy bypass in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Same-origin policy bypass in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.\", \"base64\": false}]}], \"providerMetadata\": {\"orgId\": \"f16b083a-5664-49f3-a51e-8d479e5ed7fe\", \"shortName\": \"mozilla\", \"dateUpdated\": \"2026-08-18T18:55:21.289Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-74974\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-18T19:24:49.403Z\", \"dateReserved\": \"2026-08-17T11:58:52.693Z\", \"assignerOrgId\": \"f16b083a-5664-49f3-a51e-8d479e5ed7fe\", \"datePublished\": \"2026-08-18T12:23:34.067Z\", \"assignerShortName\": \"mozilla\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Loading…
Loading…