CVE-2026-49256

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 71% 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
Trending — 4 sources updated this week
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: 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, restricted tag and tag-group names attached to publicly readable categories as allowed_tags, allowed_tag_groups, or required tag groups could leak to anonymous and unauthorized users through category and group endpoints. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
29.5%
KEV
Not listed

Published

July 9, 2026

Last Modified

July 14, 2026

Advisory Details (1)

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

Hidden tag names leaked via category serializers · Advisory · discourse/discourse · GitHub

https://github.com/discourse/discourse/security/advisories/GHSA-mwp7-572g-6qpx

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 15× 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. 2026-07-15 18:54 UTCEG score recompute
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 06:42 UTCEG score recompute▲ 1.20
  4. 2026-07-15 02:00 UTCEPSS rescore
  5. 2026-07-14 21:22 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  6. 2026-07-14 04:56 UTCEG score recompute
  7. 2026-07-13 22:30 UTCEPSS rescore
  8. 2026-07-13 06:13 UTCEPSS rescore
  9. 2026-07-13 03:15 UTCEG score recompute
  10. 2026-07-12 05:46 UTCEPSS rescore
  11. 2026-07-12 01:33 UTCEG score recompute
  12. 2026-07-11 08:27 UTCEPSS rescore
  13. 2026-07-10 23:52 UTCEG score recompute
  14. 2026-07-09 22:10 UTCEG score recompute
  15. 2026-07-09 22:10 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-49256?
CVE-2026-49256 is a high 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, restricted tag and tag-group names attached to publicly readable categories as allowedtags, allowedtag_groups, or required tag groups could leak to anonymous and unauthorized users through category…
When was CVE-2026-49256 disclosed?
CVE-2026-49256 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-2026-49256 actively exploited?
CVE-2026-49256 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 29.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-49256?
CVE-2026-49256 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-49256?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-49256, 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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