CVE-2026-49332 (GCVE-0-2026-49332)
Vulnerability from cvelistv5 – Published: 2026-07-28 12:18 – Updated: 2026-09-21 16:09
VLAI
EPSS
VEX
Title
Openshift/oauth-proxy: openshift/oauth-proxy: underscore header smuggling enables identity impersonation on wsgi/php upstreams
Summary
A flaw was found in openshift/oauth-proxy. The proxy sets authenticated identity headers using only dash-variant keys (X-Forwarded-User) but does not strip underscore-variant keys (X_Forwarded_User) from incoming requests. WSGI and PHP frameworks normalize both variants to the same variable, allowing an authenticated low-privilege user to smuggle a forged identity that may override the legitimate authenticated identity in the upstream application.
Severity
8.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-28 13:02 UTC
CWE
- CWE-436 - Interpretation Conflict
Assigner
References
13 references
Impacted products
11 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Red Hat | Red Hat OpenShift Container Platform 4.12 |
Unaffected:
1786458704 , < *
(rpm)
cpe:/a:redhat:openshift:4.12::el9 |
||
| Red Hat | Red Hat OpenShift Container Platform 4.13 |
Unaffected:
1786477436 , < *
(rpm)
cpe:/a:redhat:openshift:4.13::el9 |
||
| Red Hat | Red Hat OpenShift Container Platform 4.14 |
Unaffected:
1785549818 , < *
(rpm)
cpe:/a:redhat:openshift:4.14::el9 |
||
| Red Hat | Red Hat OpenShift Container Platform 4.15 |
Unaffected:
1787054100 , < *
(rpm)
cpe:/a:redhat:openshift:4.15::el9 |
||
| Red Hat | Red Hat OpenShift Container Platform 4.16 |
Unaffected:
1785544039 , < *
(rpm)
cpe:/a:redhat:openshift:4.16::el9 |
||
| Red Hat | Red Hat OpenShift Container Platform 4.17 |
Unaffected:
1787543313 , < *
(rpm)
cpe:/a:redhat:openshift:4.17::el9 |
||
| Red Hat | Red Hat OpenShift Container Platform 4.18 |
Unaffected:
1785529735 , < *
(rpm)
cpe:/a:redhat:openshift:4.18::el9 |
||
| Red Hat | Red Hat OpenShift Container Platform 4.19 |
Unaffected:
1785521728 , < *
(rpm)
cpe:/a:redhat:openshift:4.19::el9 |
||
| Red Hat | Red Hat OpenShift Container Platform 4.20 |
Unaffected:
1785833742 , < *
(rpm)
cpe:/a:redhat:openshift:4.20::el9 |
||
| Red Hat | Red Hat OpenShift Container Platform 4.21 |
Unaffected:
1785851359 , < *
(rpm)
cpe:/a:redhat:openshift:4.21::el9 |
||
| Red Hat | Red Hat OpenShift Container Platform 4.22 |
Unaffected:
1785885351 , < *
(rpm)
cpe:/a:redhat:openshift:4.22::el9 |
Date Public
2026-07-28 12:00
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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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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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