CVE-2026-49977

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 90% 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
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.3Exploit: None knownExposed: 0

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

tarteaucitron.js is a compliant and accessible cookie banner. Prior to 1.33.0, tarteaucitron.cookie.purge() is called on any element with the purgeBtn class and does not check whether the element is a legitimate tarteaucitron button or whether the cookie corresponds to a service handled by tarteaucitron. If an attacker can write HTML with data attributes, an element with data-cookie can silently delete a non-HttpOnly cookie with a known name when clicked by a user. This issue is fixed in version 1.33.0.

CVSS v3
4.3
EG Score
4.3(medium)
EG Risk
19(Track)
EG Risk 19/100SSVC: Track

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
Severity43% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
10%
KEV
Not listed

Published

July 10, 2026

Last Modified

July 23, 2026

Advisory Details (4)

Auto-updated Jul 17, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_release, github.
generic

TacJS - Moderately critical - Improper Access Control - SA-CONTRIB-2026-040 | Drupal.org

https://www.drupal.org/sa-contrib-2026-040
github Patch Available🟡 PoC Available

data-cookie attribute can be used to delete arbitrary cookies · Advisory · AmauriC/tarteaucitron.js · GitHub

https://github.com/AmauriC/tarteaucitron.js/security/advisories/GHSA-jxj7-g6gm-49j7
github_release Patch Available

v1.33.0

Patch available: AmauriC/tarteaucitron.js v1.33.0

https://github.com/AmauriC/tarteaucitron.js/releases/tag/v1.33.0
github_commit Patch Available

commit 24b5464400ae (AmauriC/tarteaucitron.js)

Patch available: AmauriC/tarteaucitron.js v1.33.0 (contains commit 24b5464400ae)

https://github.com/AmauriC/tarteaucitron.js/commit/24b5464400ae2ff1ad96a092c629b9d632b9cc93

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.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
tarteaucitronjs—1.33.0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 14× 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. 2026-07-27 02:55 UTCEG score recompute
  2. 2026-07-26 14:54 UTCEPSS rescore
  3. 2026-07-26 05:06 UTCEG score recompute
  4. 2026-07-25 14:18 UTCEPSS rescore
  5. 2026-07-24 14:18 UTCEPSS rescore
  6. 2026-07-23 14:18 UTCEPSS rescore
  7. 2026-07-23 03:18 UTCEG score recompute
  8. 2026-07-22 14:08 UTCEPSS rescore
  9. 2026-07-20 17:08 UTCEPSS rescore
  10. 2026-07-19 14:31 UTCEPSS rescore
  11. 2026-07-19 14:31 UTCEPSS rescore
  12. 2026-07-19 03:42 UTCEG score recompute
  13. 2026-07-19 02:29 UTCEPSS rescore
  14. 2026-07-10 16:14 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-49977?
CVE-2026-49977 is a medium vulnerability published on July 10, 2026. tarteaucitron.js is a compliant and accessible cookie banner. Prior to 1.33.0, tarteaucitron.cookie.purge() is called on any element with the purgeBtn class and does not check whether the element is a legitimate tarteaucitron button or whether the cookie corresponds to a service handled by…
When was CVE-2026-49977 disclosed?
CVE-2026-49977 was first published in the National Vulnerability Database on July 10, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-49977 actively exploited?
CVE-2026-49977 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 89.9% of all scored CVEs.
What is the CVSS score of CVE-2026-49977?
CVE-2026-49977 has a CVSS v3 base score of 4.3 (NVD).
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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-49977

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