CVE-2026-63771

HIGHPre-NVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

Score 7.1 from GitHub Security Advisory published 2026-07-20. the CNA's CVSS baseline 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this weekElevated
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.1Exploit: Elevated riskExposed: 0

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

Adminer before 5.4.3 contains a cookie injection vulnerability that allows attackers to manipulate cookie attributes by injecting arbitrary values through the unsanitized X-Forwarded-Prefix HTTP header used in Set-Cookie path attributes. Attackers can exploit a misconfigured reverse proxy to downgrade SameSite protection and enable cross-origin authenticated requests, bypassing cookie security controls.

CVSS v3
7.1
EG Score
7.1(medium)
EG Risk
48(Track)
EG Risk 48/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity71% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
36%
KEV
Not listed

Published

July 20, 2026

Last Modified

July 28, 2026

Advisory Details (4)

Auto-updated Jul 20, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

Adminer < 5.4.3 Cookie Injection via X-Forwarded-Prefix Header | Advisories | VulnCheck

https://www.vulncheck.com/advisories/adminer-cookie-injection-via-x-forwarded-prefix-header
github Patch Available🟡 PoC Available

Cookie Attribute Injection via Unsanitized X-Forwarded-Prefix in Set-Cookie Headers · Advisory · vrana/adminer · GitHub

https://github.com/vrana/adminer/security/advisories/GHSA-c533-9qwm-8w5h
generic

Releases · vrana/adminer · GitHub

https://github.com/vrana/adminer/releases#release-v5.4.3
generic

Cookie Header Injection via Unsanitized X-Forwarded-Prefix in Set-Cookie Path · Issue #1298 · vrana/adminer · GitHub

https://github.com/vrana/adminer/issues/1298

Vendor Advisories for CVE-2026-63771(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
adminer4.7.9-2 ... 5.4.4+dfsg-1 (12 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
adminer4.8.1-1 ... 6.0.1-1 (13 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
adminer5.2.1+dfsg-1 ... 6.0.1-1 (9 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
adminer5.2.1+dfsg-1, 5.3.0+dfsg-1, 5.4.0+dfsg-1, 5.4.1+dfsg-1, 5.4.2+dfsg-15.4.3+dfsg-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 19× in last 7d / 89× 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.

Showing the most recent 100 of 181 total refreshes for this CVE.

  1. 2026-09-11 20:58 UTCEG score recompute
  2. 2026-09-11 20:58 UTCGHSA enrichment
  3. 2026-09-11 14:53 UTCEPSS rescore
  4. 2026-09-11 09:37 UTCEPSS rescore
  5. 2026-09-11 09:20 UTCEG score recompute
  6. 2026-09-11 09:20 UTCGHSA enrichment
  7. 2026-09-09 11:50 UTCEG score recompute
  8. 2026-09-09 11:50 UTCGHSA enrichment
  9. 2026-09-08 22:01 UTCEPSS rescore
  10. 2026-09-07 22:49 UTCEG score recompute
  11. 2026-09-07 22:49 UTCGHSA enrichment
  12. 2026-09-07 16:01 UTCEPSS rescore
  13. 2026-09-06 13:47 UTCEPSS rescore
  14. 2026-09-06 11:30 UTCGHSA enrichment
  15. 2026-09-05 20:54 UTCEG score recompute
  16. 2026-09-05 20:54 UTCGHSA enrichment
  17. 2026-09-05 15:31 UTCEPSS rescore
  18. 2026-09-05 09:23 UTCEG score recompute
  19. 2026-09-05 09:23 UTCGHSA enrichment
  20. 2026-09-04 05:07 UTCEPSS rescore
  21. 2026-09-02 14:12 UTCEPSS rescore
  22. 2026-09-02 01:04 UTCEG score recompute
  23. 2026-09-02 01:03 UTCGHSA enrichment
  24. 2026-09-01 13:54 UTCEPSS rescore
  25. 2026-09-01 04:40 UTCEPSS rescore
Show 75 more
  1. 2026-08-31 03:01 UTCEG score recompute
  2. 2026-08-31 03:01 UTCGHSA enrichment
  3. 2026-08-30 19:17 UTCEPSS rescore
  4. 2026-08-30 15:29 UTCGHSA enrichment
  5. 2026-08-30 02:31 UTCEG score recompute
  6. 2026-08-30 02:31 UTCGHSA enrichment
  7. 2026-08-30 01:22 UTCEPSS rescore
  8. 2026-08-28 21:42 UTCEPSS rescore
  9. 2026-08-27 23:07 UTCEG score recompute
  10. 2026-08-27 23:07 UTCGHSA enrichment
  11. 2026-08-27 14:25 UTCEPSS rescore
  12. 2026-08-27 11:35 UTCGHSA enrichment
  13. 2026-08-26 21:42 UTCEG score recompute
  14. 2026-08-26 21:42 UTCGHSA enrichment
  15. 2026-08-26 14:46 UTCEPSS rescore
  16. 2026-08-26 05:56 UTCGHSA enrichment
  17. 2026-08-25 18:24 UTCEG score recompute
  18. 2026-08-25 18:24 UTCGHSA enrichment
  19. 2026-08-25 13:49 UTCEPSS rescore
  20. 2026-08-25 06:44 UTCGHSA enrichment
  21. 2026-08-24 18:56 UTCEG score recompute
  22. 2026-08-24 18:56 UTCGHSA enrichment
  23. 2026-08-24 06:34 UTCGHSA enrichment
  24. 2026-08-23 19:02 UTCGHSA enrichment
  25. 2026-08-23 07:31 UTCGHSA enrichment
  26. 2026-08-22 19:58 UTCGHSA enrichment
  27. 2026-08-22 08:26 UTCEG score recompute
  28. 2026-08-22 08:26 UTCGHSA enrichment
  29. 2026-08-21 23:49 UTCEPSS rescore
  30. 2026-08-21 20:54 UTCGHSA enrichment
  31. 2026-08-21 09:22 UTCEG score recompute
  32. 2026-08-21 09:22 UTCGHSA enrichment
  33. 2026-08-20 22:55 UTCEPSS rescore
  34. 2026-08-20 21:50 UTCGHSA enrichment
  35. 2026-08-20 10:18 UTCGHSA enrichment
  36. 2026-08-19 22:47 UTCEG score recompute
  37. 2026-08-19 22:47 UTCGHSA enrichment
  38. 2026-08-19 17:04 UTCEPSS rescore
  39. 2026-08-19 08:25 UTCGHSA enrichment
  40. 2026-08-18 20:54 UTCEG score recompute
  41. 2026-08-18 20:54 UTCGHSA enrichment
  42. 2026-08-18 13:48 UTCEPSS rescore
  43. 2026-08-18 09:21 UTCGHSA enrichment
  44. 2026-08-17 21:01 UTCEG score recompute
  45. 2026-08-17 21:00 UTCGHSA enrichment
  46. 2026-08-17 13:47 UTCEPSS rescore
  47. 2026-08-17 06:43 UTCGHSA enrichment
  48. 2026-08-16 19:12 UTCEG score recompute
  49. 2026-08-16 19:12 UTCGHSA enrichment
  50. 2026-08-16 14:56 UTCEPSS rescore
  51. 2026-08-16 07:16 UTCEG score recompute
  52. 2026-08-16 07:16 UTCGHSA enrichment
  53. 2026-08-15 19:45 UTCGHSA enrichment
  54. 2026-08-15 08:13 UTCEG score recompute
  55. 2026-08-15 08:13 UTCGHSA enrichment
  56. 2026-08-15 01:30 UTCEPSS rescore
  57. 2026-08-14 20:41 UTCGHSA enrichment
  58. 2026-08-14 09:10 UTCEG score recompute
  59. 2026-08-14 09:10 UTCGHSA enrichment
  60. 2026-08-13 22:00 UTCEPSS rescore
  61. 2026-08-13 21:38 UTCGHSA enrichment
  62. 2026-08-13 10:07 UTCGHSA enrichment
  63. 2026-08-12 22:35 UTCEG score recompute
  64. 2026-08-12 22:35 UTCGHSA enrichment
  65. 2026-08-12 13:51 UTCEPSS rescore
  66. 2026-08-12 11:04 UTCGHSA enrichment
  67. 2026-08-11 23:32 UTCEG score recompute
  68. 2026-08-11 23:32 UTCGHSA enrichment
  69. 2026-08-11 12:00 UTCGHSA enrichment
  70. 2026-08-11 00:28 UTCEG score recompute
  71. 2026-08-11 00:28 UTCGHSA enrichment
  72. 2026-08-11 00:00 UTCEPSS rescore
  73. 2026-08-10 12:57 UTCGHSA enrichment
  74. 2026-08-10 01:25 UTCGHSA enrichment
  75. 2026-08-09 13:54 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-63771?
CVE-2026-63771 is a high vulnerability published on July 20, 2026. Adminer before 5.4.3 contains a cookie injection vulnerability that allows attackers to manipulate cookie attributes by injecting arbitrary values through the unsanitized X-Forwarded-Prefix HTTP header used in Set-Cookie path attributes. Attackers can exploit a misconfigured reverse proxy to…
When was CVE-2026-63771 disclosed?
CVE-2026-63771 was first published in the National Vulnerability Database on July 20, 2026, with the most recent update on July 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-63771 actively exploited?
CVE-2026-63771 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 63.7% of all scored CVEs.
What is the CVSS score of CVE-2026-63771?
CVE-2026-63771 has a CVSS v4.0 base score of 7.1 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-63771?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63771, 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

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