CVE-2026-53963

CRITICALNVD 9.09.0
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This critical-severity CVE scores 9.0 under NVD CVSS v3. EPSS exploit probability: 0.7% (53rd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
9.0EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 9.0Exploit: None knownExposed services: Not assessed

The CVE record names the fixed release — apply it.

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
9.0CRITICALmedium confidence
EG Risk
41
EG Risk 41/100

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 (value × EchelonGraph’s weight)
Severity90% × 45%
The EG Score, 9.0 of 10.
Exploitation0.7% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: The CVE record names the fixed release. Apply it within your standard update timelines.
EPSS PROB
0.7%
EPSS %ILE
53rd
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

The CVE record names the fixed release. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 9, 2026

Last Modified

July 14, 2026

Advisory Details (5)

Auto-updated Jul 9, 2026
Fix named in the CVE record. Sources: github_commit, github.
GitHub advisoryMentions a patch (unverified)

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 13× in last 7d / 36× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 146 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 46 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-14 08:57 UTCEG score recompute
  2. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  3. 2026-10-13 05:21 UTCEG score recompute
  4. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  5. 2026-10-12 15:57 UTCEG score recompute
  6. 2026-10-11 19:40 UTCEG score recompute
  7. 2026-10-11 16:55 UTCEG score recompute
  8. 2026-10-11 14:18 UTCEG score recompute
  9. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  12. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  13. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  14. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  15. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  16. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  17. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  18. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  19. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  20. 2026-10-01 16:00 UTCEG score recompute
  21. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  22. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  23. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  24. 2026-09-28 09:59 UTCEG score recompute
  25. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
Show 75 more
  1. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  2. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  3. 2026-09-24 11:22 UTCEG score recompute
  4. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  5. 2026-09-23 05:51 UTCEG score recompute
  6. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  7. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  8. 2026-09-18 05:27 UTCEG score recompute
  9. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  10. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  11. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  12. 2026-09-13 23:45 UTCEG score recompute
  13. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  14. 2026-09-13 08:16 UTCEG score recompute
  15. 2026-09-12 03:20 UTCEG score recompute
  16. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  17. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  18. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  19. 2026-09-08 03:32 UTCEG score recompute
  20. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  21. 2026-09-06 13:58 UTCEG score recompute
  22. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  23. 2026-09-05 22:00 UTCEG score recompute
  24. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  25. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  26. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  27. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  28. 2026-08-30 20:55 UTCEG score recompute
  29. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  30. 2026-08-30 06:42 UTCEG score recompute
  31. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  32. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  33. 2026-08-27 21:43 UTCEG score recompute
  34. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  35. 2026-08-27 00:55 UTCEG score recompute
  36. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  37. 2026-08-25 14:46 UTCEG score recompute
  38. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  39. 2026-08-24 20:19 UTCEG score recompute
  40. 2026-08-24 09:33 UTCEG score recompute
  41. 2026-08-23 02:36 UTCEG score recompute
  42. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  43. 2026-08-22 01:11 UTCEG score recompute
  44. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  45. 2026-08-20 23:43 UTCEG score recompute
  46. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  47. 2026-08-20 01:38 UTCEG score recompute
  48. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  49. 2026-08-18 20:40 UTCEG score recompute
  50. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  51. 2026-08-17 16:47 UTCEG score recompute
  52. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  53. 2026-08-16 19:36 UTCEG score recompute
  54. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  55. 2026-08-16 06:03 UTCEG score recompute
  56. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  57. 2026-08-15 04:40 UTCEG score recompute
  58. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  59. 2026-08-13 23:02 UTCEG score recompute
  60. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  61. 2026-08-12 17:20 UTCEG score recompute
  62. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  63. 2026-08-11 15:50 UTCEG score recompute
  64. 2026-08-11 03:08 UTCEG score recompute
  65. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  66. 2026-08-09 17:15 UTCEG score recompute
  67. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  68. 2026-08-08 20:06 UTCEG score recompute
  69. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  70. 2026-08-07 18:40 UTCEG score recompute
  71. 2026-08-06 17:11 UTCEG score recompute
  72. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  73. 2026-08-05 20:01 UTCEG score recompute
  74. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  75. 2026-08-04 18:14 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-53963?
CVE-2026-53963 is a critical-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-53963 published?
The CVE record for CVE-2026-53963 was published on July 9, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of July 14, 2026; the record at its source may have been updated since.
Is CVE-2026-53963 actively exploited?
CVE-2026-53963 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (53rd percentile of EPSS-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?
The CVE record for CVE-2026-53963 names the fix: "This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5."

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