CVE-2026-53963

CRITICALNVD 9.09.0—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.0 under NVD CVSS v3. EPSS exploit probability: 0.7%, top 49% 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, nvd
9.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.0Exploit: None knownExposed: 0

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

Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, a malicious second factor name on an attacker-controlled account was not escaped in the delete confirmation dialog, allowing stored cross-site scripting when an administrator impersonated that account. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.

CVSS v3
9.0
EG Score
9.0(medium)
EG Risk
41(Track)
EG Risk 41/100SSVC: 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
Severity90% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
51%
KEV
Not listed

Published

July 9, 2026

Last Modified

July 14, 2026

Advisory Details (5)

Auto-updated Jul 9, 2026
Patch available. Sources: github_commit, github.
github Patch Available

Stored-XSS in 2FA delete confirmation modal · Advisory · discourse/discourse · GitHub

https://github.com/discourse/discourse/security/advisories/GHSA-wg5x-7f23-m3r5
github_commit

commit daea5214d833 (discourse/discourse)

Fix landed in discourse/discourse commit daea5214d833 — awaiting tagged release

https://github.com/discourse/discourse/commit/daea5214d833eacbdd3b1a78d99eb14e9cabd915
github_commit

commit d92973e51a46 (discourse/discourse)

Fix landed in discourse/discourse commit d92973e51a46 — awaiting tagged release

https://github.com/discourse/discourse/commit/d92973e51a46cf6dd20c71e6068e6769b67eea5b
github_commit

commit 529e17d4d570 (discourse/discourse)

Fix landed in discourse/discourse commit 529e17d4d570 — awaiting tagged release

https://github.com/discourse/discourse/commit/529e17d4d570a48972e7cf64720e5dd1fdf23ca8
github_commit

commit 40de62cddadc (discourse/discourse)

Fix landed in discourse/discourse commit 40de62cddadc — awaiting tagged release

https://github.com/discourse/discourse/commit/40de62cddadc65c328a1028ab999f3fa94adbfed

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 55× 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. 2026-08-30 06:42 UTCEG score recompute
  2. 2026-08-30 01:22 UTCEPSS rescore
  3. 2026-08-28 21:41 UTCEPSS rescore
  4. 2026-08-27 21:43 UTCEG score recompute
  5. 2026-08-27 14:25 UTCEPSS rescore
  6. 2026-08-27 00:55 UTCEG score recompute
  7. 2026-08-26 14:46 UTCEPSS rescore
  8. 2026-08-25 14:46 UTCEG score recompute
  9. 2026-08-25 13:49 UTCEPSS rescore
  10. 2026-08-24 20:19 UTCEG score recompute
  11. 2026-08-24 09:33 UTCEG score recompute
  12. 2026-08-23 02:36 UTCEG score recompute
  13. 2026-08-23 00:19 UTCEPSS rescore
  14. 2026-08-22 01:11 UTCEG score recompute
  15. 2026-08-21 23:49 UTCEPSS rescore
  16. 2026-08-20 23:43 UTCEG score recompute
  17. 2026-08-20 22:55 UTCEPSS rescore
  18. 2026-08-20 01:38 UTCEG score recompute
  19. 2026-08-19 17:04 UTCEPSS rescore
  20. 2026-08-18 20:40 UTCEG score recompute
  21. 2026-08-18 13:48 UTCEPSS rescore
  22. 2026-08-17 16:47 UTCEG score recompute
  23. 2026-08-17 13:47 UTCEPSS rescore
  24. 2026-08-16 19:36 UTCEG score recompute
  25. 2026-08-16 14:56 UTCEPSS rescore
Show 67 more
  1. 2026-08-16 06:03 UTCEG score recompute
  2. 2026-08-16 02:14 UTCEPSS rescore
  3. 2026-08-15 04:40 UTCEG score recompute
  4. 2026-08-15 01:30 UTCEPSS rescore
  5. 2026-08-13 23:02 UTCEG score recompute
  6. 2026-08-13 22:00 UTCEPSS rescore
  7. 2026-08-12 17:20 UTCEG score recompute
  8. 2026-08-12 13:51 UTCEPSS rescore
  9. 2026-08-11 15:50 UTCEG score recompute
  10. 2026-08-11 03:08 UTCEG score recompute
  11. 2026-08-11 00:00 UTCEPSS rescore
  12. 2026-08-09 17:15 UTCEG score recompute
  13. 2026-08-09 13:46 UTCEPSS rescore
  14. 2026-08-08 20:06 UTCEG score recompute
  15. 2026-08-08 16:37 UTCEPSS rescore
  16. 2026-08-07 18:40 UTCEG score recompute
  17. 2026-08-06 17:11 UTCEG score recompute
  18. 2026-08-06 13:47 UTCEPSS rescore
  19. 2026-08-05 20:01 UTCEG score recompute
  20. 2026-08-05 19:17 UTCEPSS rescore
  21. 2026-08-04 18:14 UTCEG score recompute
  22. 2026-08-04 15:10 UTCEPSS rescore
  23. 2026-08-04 13:37 UTCEG score recompute
  24. 2026-08-04 10:39 UTCEPSS rescore
  25. 2026-08-03 13:00 UTCEG score recompute
  26. 2026-08-03 10:36 UTCEPSS rescore
  27. 2026-08-02 03:02 UTCEG score recompute
  28. 2026-08-02 02:27 UTCEPSS rescore
  29. 2026-08-01 05:49 UTCEG score recompute
  30. 2026-08-01 04:16 UTCEPSS rescore
  31. 2026-07-30 19:10 UTCEG score recompute
  32. 2026-07-30 16:28 UTCEPSS rescore
  33. 2026-07-30 10:15 UTCEG score recompute
  34. 2026-07-30 01:42 UTCEG score recompute
  35. 2026-07-30 01:30 UTCEPSS rescore
  36. 2026-07-28 17:39 UTCEG score recompute
  37. 2026-07-28 15:37 UTCEPSS rescore
  38. 2026-07-27 15:35 UTCEG score recompute
  39. 2026-07-26 16:31 UTCEG score recompute
  40. 2026-07-26 14:54 UTCEPSS rescore
  41. 2026-07-26 12:15 UTCEG score recompute
  42. 2026-07-25 14:18 UTCEPSS rescore
  43. 2026-07-24 14:18 UTCEPSS rescore
  44. 2026-07-23 14:18 UTCEPSS rescore
  45. 2026-07-23 03:19 UTCEG score recompute
  46. 2026-07-22 14:08 UTCEPSS rescore
  47. 2026-07-21 15:25 UTCEPSS rescore
  48. 2026-07-20 17:08 UTCEPSS rescore
  49. 2026-07-19 14:31 UTCEPSS rescore
  50. 2026-07-19 14:31 UTCEPSS rescore
  51. 2026-07-19 02:29 UTCEPSS rescore
  52. 2026-07-18 10:04 UTCEPSS rescore
  53. 2026-07-16 17:03 UTCEPSS rescore
  54. 2026-07-15 16:57 UTCEPSS rescore
  55. 2026-07-15 16:57 UTCEPSS rescore
  56. 2026-07-15 02:00 UTCEPSS rescore
  57. 2026-07-15 02:00 UTCEPSS rescore
  58. 2026-07-14 11:02 UTCEG score recompute▲ 1.70
  59. 2026-07-14 01:43 UTCNVD updateCVSS v3 → 9 · severity → CRITICAL
  60. 2026-07-13 22:31 UTCEPSS rescore
  61. 2026-07-13 06:13 UTCEPSS rescore
  62. 2026-07-13 06:13 UTCEPSS rescore
  63. 2026-07-12 05:46 UTCEPSS rescore
  64. 2026-07-11 08:27 UTCEPSS rescore
  65. 2026-07-11 08:27 UTCEPSS rescore
  66. 2026-07-09 22:10 UTCEG score recompute
  67. 2026-07-09 22:10 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-53963?
CVE-2026-53963 is a critical vulnerability published on July 9, 2026. Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, a malicious second factor name on an attacker-controlled account was not escaped in the delete confirmation dialog, allowing stored cross-site scripting when an administrator impersonated that…
When was CVE-2026-53963 disclosed?
CVE-2026-53963 was first published in the National Vulnerability Database on July 9, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53963 actively exploited?
CVE-2026-53963 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 48.5% of all scored CVEs.
What is the CVSS score of CVE-2026-53963?
CVE-2026-53963 has a CVSS v3 base score of 9.0 (NVD).
How do I remediate CVE-2026-53963?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53963, 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.

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