CVE-2026-53961

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (20th percentile of EPSS-scored CVEs). 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
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 6.5Exploit: 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, the AWS SES bounce webhook at POST /webhooks/aws verified that SNS messages were signed by Amazon but did not bind them to trusted TopicArn values, allowing any AWS account holder to publish validly signed forged Bounce notifications that revoke a targeted user email. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
44
EG Risk 44/100CISA SSVC

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
Severity65% × 45%
Exploitation0% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: The CVE record names the fixed release. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.3%
EPSS %ILE
20th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

The CVE record names the fixed release. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

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.
githubMentions a patch (unverified)

Forged AWS SNS bounce notifications can disable a targeted user's email (missing TopicArn binding) · Advisory · discourse/discourse · GitHub

https://github.com/discourse/discourse/security/advisories/GHSA-8f9m-v436-wr3x
github_commit

commit aea351907912 (discourse/discourse)

Fix landed in discourse/discourse commit aea351907912 — awaiting tagged release

https://github.com/discourse/discourse/commit/aea35190791261bab258ebab05da279e78cdd0e6
github_commit

commit 958f0cd831d6 (discourse/discourse)

Fix landed in discourse/discourse commit 958f0cd831d6 — awaiting tagged release

https://github.com/discourse/discourse/commit/958f0cd831d65a49ec75f05343ca2c167679f0ea
github_commit

commit 61f12e13aa1b (discourse/discourse)

Fix landed in discourse/discourse commit 61f12e13aa1b — awaiting tagged release

https://github.com/discourse/discourse/commit/61f12e13aa1b760f81d5ff60f12e3a7e77434b94
github_commit

commit 3a3d315a85ef (discourse/discourse)

Fix landed in discourse/discourse commit 3a3d315a85ef — awaiting tagged release

https://github.com/discourse/discourse/commit/3a3d315a85ef3c6aabfc7e7bb38702059784f06b

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 32× 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 118 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-53961?
CVE-2026-53961 is a medium 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, the AWS SES bounce webhook at POST /webhooks/aws verified that SNS messages were signed by Amazon but did not bind them to trusted TopicArn values, allowing any AWS account holder to publish…
When was CVE-2026-53961 disclosed?
CVE-2026-53961 was first published 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-2026-53961 actively exploited?
CVE-2026-53961 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (20th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-53961?
CVE-2026-53961 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-53961?
The CVE record for CVE-2026-53961 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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