CVE-2026-20896

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.8%, top 48% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Gitea Docker image versions up to and including 1.26.2 use REVERSE_PROXY_TRUSTED_PROXIES=* by default, allowing any source IP to impersonate a user when reverse-proxy authentication headers such as X-WEBAUTH-USER are enabled.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
51.8%
KEV
Not listed

Published

July 3, 2026

Last Modified

July 7, 2026

Advisory Details (4)

Auto-updated Jul 8, 2026
🔬 Proof of concept available. Patch available. Sources: github_pr, github_release, github.
github Patch Available🟡 PoC Available

Gitea Docker image: `REVERSE_PROXY_TRUSTED_PROXIES = *` default lets any source IP impersonate any user via `X-WEBAUTH-USER` · Advisory · go-gitea/gitea · GitHub

https://github.com/go-gitea/gitea/security/advisories/GHSA-f75j-4cw6-rmx4
github_release Patch Available

v1.26.3

Patch available: go-gitea/gitea v1.26.3

https://github.com/go-gitea/gitea/releases/tag/v1.26.3
github_pr

fix: Various security fixes (#38103)

Fix merged in go-gitea/gitea PR #38151 on 2026-06-17 — awaiting tagged release

https://github.com/go-gitea/gitea/pull/38151
generic

Gitea 1.26.3 and 1.26.4 are released | Gitea Blog

https://blog.gitea.com/release-of-1.26.3-and-1.26.4/

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 54× in last 7d / 90× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-15 10:14 UTCEG score recompute
  2. 2026-07-15 06:18 UTCEG score recompute
  3. 2026-07-15 02:25 UTCEG score recompute
  4. 2026-07-15 02:00 UTCEPSS rescore
  5. 2026-07-15 02:00 UTCEPSS rescore
  6. 2026-07-14 22:33 UTCEG score recompute
  7. 2026-07-14 18:39 UTCEG score recompute
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  13. 2026-07-13 22:30 UTCEPSS rescore
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  18. 2026-07-13 06:13 UTCEPSS rescore
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  20. 2026-07-13 03:52 UTCEG score recompute
  21. 2026-07-12 23:59 UTCEG score recompute
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  25. 2026-07-12 08:29 UTCEG score recompute
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  1. 2026-07-12 05:46 UTCEPSS rescore
  2. 2026-07-12 05:46 UTCEPSS rescore
  3. 2026-07-12 04:37 UTCEG score recompute
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  5. 2026-07-11 20:51 UTCEG score recompute
  6. 2026-07-11 16:58 UTCEG score recompute
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  9. 2026-07-11 08:27 UTCEPSS rescore
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  18. 2026-07-09 22:19 UTCEG score recompute
  19. 2026-07-09 19:10 UTCEPSS rescore
  20. 2026-07-09 18:26 UTCEG score recompute
  21. 2026-07-09 14:34 UTCEG score recompute
  22. 2026-07-09 10:42 UTCEG score recompute
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  24. 2026-07-09 02:51 UTCEG score recompute
  25. 2026-07-08 22:59 UTCEG score recompute
  26. 2026-07-08 19:06 UTCEG score recompute
  27. 2026-07-08 15:15 UTCEPSS rescore
  28. 2026-07-08 15:15 UTCEPSS rescore
  29. 2026-07-08 15:14 UTCEG score recompute
  30. 2026-07-08 11:22 UTCEG score recompute
  31. 2026-07-08 07:29 UTCEG score recompute
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  34. 2026-07-07 19:52 UTCEG score recompute
  35. 2026-07-07 16:00 UTCEG score recompute
  36. 2026-07-07 13:46 UTCEPSS rescore
  37. 2026-07-07 11:58 UTCEG score recompute
  38. 2026-07-07 08:06 UTCEG score recompute
  39. 2026-07-07 04:11 UTCEG score recompute
  40. 2026-07-07 00:17 UTCEG score recompute
  41. 2026-07-06 20:24 UTCEG score recompute
  42. 2026-07-06 16:33 UTCEG score recompute
  43. 2026-07-06 16:27 UTCEPSS rescore
  44. 2026-07-06 16:27 UTCEPSS rescore
  45. 2026-07-06 12:40 UTCEG score recompute
  46. 2026-07-06 08:46 UTCEG score recompute
  47. 2026-07-06 04:51 UTCEG score recompute
  48. 2026-07-06 02:23 UTCEPSS rescore
  49. 2026-07-06 02:23 UTCEPSS rescore
  50. 2026-07-06 00:58 UTCEG score recompute
  51. 2026-07-05 21:04 UTCEG score recompute
  52. 2026-07-05 17:10 UTCEG score recompute
  53. 2026-07-05 13:17 UTCEG score recompute
  54. 2026-07-05 09:24 UTCEG score recompute
  55. 2026-07-05 05:31 UTCEG score recompute
  56. 2026-07-05 02:30 UTCEPSS rescore
  57. 2026-07-05 01:39 UTCEG score recompute
  58. 2026-07-04 21:47 UTCEG score recompute
  59. 2026-07-04 17:55 UTCEG score recompute
  60. 2026-07-04 14:02 UTCEG score recompute
  61. 2026-07-04 10:08 UTCEG score recompute
  62. 2026-07-04 06:15 UTCEG score recompute
  63. 2026-07-04 02:23 UTCEG score recompute
  64. 2026-07-03 22:30 UTCEG score recompute
  65. 2026-07-03 22:27 UTCNVD updatefirst tracked

Publicly available exploits

(2 references)

Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCszybnev/cve-2026-20896-gitea-poc
    First seen Jul 7, 2026

    CVE-2026-20896 Gitea Docker X-WEBAUTH-USER auth bypass checker

    Open source ↗
  • GitHub PoCrz1027/CVE-2026-20896
    First seen Jul 5, 2026

    Public PoC and detector for CVE-2026-20896 ("Gitea Docker: One Header, Any User")

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-20896?
CVE-2026-20896 is a critical vulnerability published on July 3, 2026. Gitea Docker image versions up to and including 1.26.2 use REVERSEPROXYTRUSTED_PROXIES=* by default, allowing any source IP to impersonate a user when reverse-proxy authentication headers such as X-WEBAUTH-USER are enabled.
When was CVE-2026-20896 disclosed?
CVE-2026-20896 was first published in the National Vulnerability Database on July 3, 2026, with the most recent update on July 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20896 actively exploited?
CVE-2026-20896 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 51.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-20896?
CVE-2026-20896 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-20896?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20896, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-20896

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