CVE-2026-49977

MEDIUMPre-NVD 4.34.3
EchelonGraph scoreLOW confidence

This medium-severity CVE scores 4.3 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). 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: cna:github_m
4.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: —CVSS: 4.3Exploit: NoneExposed: 0

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

tarteaucitron: data-cookie attribute can be used to delete arbitrary cookies

Summary

tarteaucitron provides a list of cookies and buttons to delete them. If an attacker can write HTML with data attributes, they could create an element that silently deletes a cookie when clicked and trick a user to delete this cookie.

Details

tarteaucitron.cookie.purge() is called on any element with the purgeBtn class. It does not check if the element is a legitimate tarteaucitron button or if the cookie corresponds to a service handled by tarteaucitron.

PoC

Click me!

If someone has a cookie with this name and clicks on the link, the cookie is silently deleted.

Impact

The impact is limited because this only works on cookies without HttpOnly=true and the attacker has to know the name of the cookie.

CVSS v3
4.3
EG Score
4.3(low)
EPSS
—
KEV
Not listed

Published

July 10, 2026

Last Modified

July 10, 2026

Vendor Advisories for CVE-2026-49977(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Data Freshness Timeline

(refreshed 6× in last 7d / 6× 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 05:14 UTCEG score recompute
  2. 2026-07-14 07:26 UTCEG score recompute
  3. 2026-07-13 09:38 UTCEG score recompute
  4. 2026-07-12 11:50 UTCEG score recompute
  5. 2026-07-11 14:02 UTCEG score recompute
  6. 2026-07-10 16:14 UTCEG score recompute

Frequently asked(4)

What is CVE-2026-49977?
CVE-2026-49977 is a medium vulnerability published on July 10, 2026. tarteaucitron: data-cookie attribute can be used to delete arbitrary cookies Summary tarteaucitron provides a list of cookies and buttons to delete them. If an attacker can write HTML with data attributes, they could create an element that silently deletes a cookie when clicked and trick a user to…
When was CVE-2026-49977 disclosed?
CVE-2026-49977 was first published in the National Vulnerability Database on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-49977?
CVE-2026-49977 has a CVSS v4.0 base score of 4.3 (CNA self-assessment; NVD's own analysis pending). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-49977?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-49977, 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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