CVE-2026-48856 (GCVE-0-2026-48856)
Vulnerability from cvelistv5 – Published: 2026-06-10 14:41 – Updated: 2026-06-11 04:45
VLAI
Title
httpc leaks Authorization header to cross-origin redirect targets
Summary
Sensitive Data Exposure vulnerability in Erlang OTP inets (httpc_response module) allows Retrieve Embedded Sensitive Data.
The httpc client forwards the Authorization and Proxy-Authorization request headers to redirect targets without checking whether the redirect crosses an origin boundary. httpc_response:redirect/2 constructs the redirected request by updating only the host field of the header record; all other fields (including authorization and proxy_authorization) are copied verbatim. The redirect target host is never compared against the original host.
autoredirect defaults to true, so this affects all httpc callers that do not explicitly disable automatic redirects.
An attacker who controls a server that the victim contacts via httpc can issue a cross-origin 3xx redirect to a server they also control. The Authorization header (including Basic credentials derived from URL userinfo via httpc_request:handle_user_info/2) is forwarded to the redirect target, allowing credential theft. The same applies to the Proxy-Authorization header.
This vulnerability is associated with program files lib/inets/src/http_client/httpc_response.erl.
This issue affects OTP from 17.0 before 29.0.2, 28.5.0.2 and 27.3.4.13 corresponding to inets from 5.10 before 9.7.1, 9.6.2.2 and 9.3.2.6.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/erlang/otp/security/advisories… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-48856.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-48856 | related |
| https://www.erlang.org/doc/system/versions.html#o… | x_version-scheme |
| https://github.com/erlang/otp/commit/688d748d6f7a… | patch |
Impacted products
2 products
Credits
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trusted servers that will not issue cross-origin redirects.\u003c/li\u003e\u003c/ul\u003e\", \"base64\": false}]}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Sensitive Data Exposure vulnerability in Erlang OTP inets (httpc_response module) allows Retrieve Embedded Sensitive Data.\\n\\nThe httpc client forwards the Authorization and Proxy-Authorization request headers to redirect targets without checking whether the redirect crosses an origin boundary. httpc_response:redirect/2 constructs the redirected request by updating only the host field of the header record; all other fields (including authorization and proxy_authorization) are copied verbatim. The redirect target host is never compared against the original host.\\n\\nautoredirect defaults to true, so this affects all httpc callers that do not explicitly disable automatic redirects.\\n\\nAn attacker who controls a server that the victim contacts via httpc can issue a cross-origin 3xx redirect to a server they also control. The Authorization header (including Basic credentials derived from URL userinfo via httpc_request:handle_user_info/2) is forwarded to the redirect target, allowing credential theft. The same applies to the Proxy-Authorization header.\\n\\nThis vulnerability is associated with program files lib/inets/src/http_client/httpc_response.erl.\\n\\nThis issue affects OTP from 17.0 before 29.0.2, 28.5.0.2 and 27.3.4.13 corresponding to inets from 5.10 before 9.7.1, 9.6.2.2 and 9.3.2.6.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Sensitive Data Exposure vulnerability in Erlang OTP inets (\u003ctt\u003ehttpc_response\u003c/tt\u003e module) allows Retrieve Embedded Sensitive Data.\u003cp\u003eThe \u003ctt\u003ehttpc\u003c/tt\u003e client forwards the \u003ctt\u003eAuthorization\u003c/tt\u003e and \u003ctt\u003eProxy-Authorization\u003c/tt\u003e request headers to redirect targets without checking whether the redirect crosses an origin boundary. \u003ctt\u003ehttpc_response:redirect/2\u003c/tt\u003e constructs the redirected request by updating only the \u003ctt\u003ehost\u003c/tt\u003e field of the header record; all other fields (including \u003ctt\u003eauthorization\u003c/tt\u003e and \u003ctt\u003eproxy_authorization\u003c/tt\u003e) are copied verbatim. The redirect target host is never compared against the original host.\u003c/p\u003e\u003cp\u003e\u003ctt\u003eautoredirect\u003c/tt\u003e defaults to \u003ctt\u003etrue\u003c/tt\u003e, so this affects all \u003ctt\u003ehttpc\u003c/tt\u003e callers that do not explicitly disable automatic redirects.\u003c/p\u003e\u003cp\u003eAn attacker who controls a server that the victim contacts via \u003ctt\u003ehttpc\u003c/tt\u003e can issue a cross-origin 3xx redirect to a server they also control. The \u003ctt\u003eAuthorization\u003c/tt\u003e header (including Basic credentials derived from URL userinfo via \u003ctt\u003ehttpc_request:handle_user_info/2\u003c/tt\u003e) is forwarded to the redirect target, allowing credential theft. The same applies to the \u003ctt\u003eProxy-Authorization\u003c/tt\u003e header.\u003c/p\u003e\u003cp\u003eThis vulnerability is associated with program files \u003ctt\u003elib/inets/src/http_client/httpc_response.erl\u003c/tt\u003e.\u003c/p\u003e\u003cp\u003eThis issue affects OTP from 17.0 before 29.0.2, 28.5.0.2 and 27.3.4.13 corresponding to inets from 5.10 before 9.7.1, 9.6.2.2 and 9.3.2.6.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-601\", \"description\": \"CWE-601 URL Redirection to Untrusted Site (\u0027Open Redirect\u0027)\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:erlang:erlang\\\\/otp:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"27.3.4.13\"}, {\"criteria\": \"cpe:2.3:a:erlang:erlang\\\\/otp:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"28.5.0.2\", \"versionStartIncluding\": \"28.0\"}, {\"criteria\": \"cpe:2.3:a:erlang:erlang\\\\/otp:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"29.0.2\", \"versionStartIncluding\": \"29.0\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-06-11T04:45:35.836Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-48856\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-11T04:45:35.836Z\", \"dateReserved\": \"2026-05-25T20:44:10.697Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-06-10T14:41:51.616Z\", \"assignerShortName\": \"EEF\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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.
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