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CVE-2026-49977 medium CVSS 4.3

Vulnerability in tarteaucitronjs (CVE-2026-49977)

Summary

Vulnerability in tarteaucitronjs (CVE-2026-49977). Risk of unauthorized operations or information disclosure. Exploitable via purgeBtn. Mitigation: upgrade to 1.33.0 or later.

Original description

The description as published by the source.

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.

Source: GitHub Security Advisories (Global) NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-49977 has been found in tarteaucitronjs.
Attackers can target a specific entry point like purgeBtn over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 4.3/10.
What to do: upgrade tarteaucitronjs to 1.33.0 or later.
If unsure, ask your IT team or search "tarteaucitronjs CVE-2026-49977" on the vendor's site.

CVE-2026-49977 (tarteaucitronjs) — CWE-285 / CVSS v3 4.3
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: purgeBtn
Patched: 1.33.0 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-285) exists in tarteaucitronjs. Attackers reach the vulnerable code path via purgeBtn without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of tarteaucitronjs. Attack surface: purgeBtn.

🔥 Severity

Severity: Medium (CVSS 4.3/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 1.33.0.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'tarteaucitronjs' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'tarteaucitronjs' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で tarteaucitronjs を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade tarteaucitronjs to 1.33.0

    ステージング環境で 1.33.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

npm tarteaucitronjs
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.33.0"}]}]

References

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