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: 0.2%, top 87% 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
Trending — 3 sources updated this week
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 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, 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
6.5(medium)
EPSS
12.6%
KEV
Not listed

Published

July 9, 2026

Last Modified

July 10, 2026

Advisory Details (5)

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

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 / 7× 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. 2026-07-12 05:46 UTCEPSS rescore
  2. 2026-07-12 02:06 UTCEG score recompute
  3. 2026-07-11 08:27 UTCEPSS rescore
  4. 2026-07-11 08:27 UTCEPSS rescore
  5. 2026-07-11 00:09 UTCEG score recompute
  6. 2026-07-09 22:11 UTCEG score recompute
  7. 2026-07-09 22:10 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

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 in the National Vulnerability Database on July 9, 2026, with the most recent update on July 10, 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 12.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-53961?
CVE-2026-53961 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-53961?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53961, 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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