Vulnerability in phpmailer/phpmailer (CVE-2020-13625)
Summary
Vulnerability in phpmailer/phpmailer (CVE-2020-13625). Data can be tampered with by attackers. Exploitable via filename.html. Mitigation: upgrade to 6.1.6 or later.
Original description
The description as published by the source.
PHPMailer before 6.1.6 contains an output escaping bug when the name of a file attachment contains a double quote character. This can result in the file type being misinterpreted by the receiver or any mail relay processing the message.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
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-2020-13625 has been found in phpmailer/phpmailer.
Attackers can target a specific entry point like filename.html over the network to misuse the product.
Data can be tampered with by attackers.
What to do: upgrade phpmailer/phpmailer to 6.1.6 or later.
If unsure, ask your IT team or search "phpmailer/phpmailer CVE-2020-13625" on the vendor's site.
CVE-2020-13625 (phpmailer/phpmailer) — CWE-116
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: filename.html / attachment.tmp
Patched: 6.1.6 — apply immediately
Workaround: Reject or filter names and filenames containing double quote (") characters before passing them to attachment functions such as addAttachment().
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.
A vulnerability (CWE-116) exists in phpmailer/phpmailer. Attackers reach the vulnerable code path via filename.html without authentication.
Check the vendor advisory for the affected versions of phpmailer/phpmailer. Attack surface: filename.html / attachment.tmp.
Severity: ?. Data can be tampered with by attackers.
Update to 6.1.6.
Workaround: Reject or filter names and filenames containing double quote (") characters before passing them to attachment functions such as addAttachment().
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'phpmailer/phpmailer' . 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
-
1Identify exposure identify
grep -r 'phpmailer/phpmailer' . | 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
phpmailer/phpmailerを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply temporary workaround mitigate
Reject or filter names and filenames containing double quote (`"`) characters before passing them to attachment functions such as `addAttachment()`.パッチが適用されるまでの応急処置として、Reject or filter names and filenames containing double quote (
") characters before passing them to attachment functions such asaddAttachment(). を実施。回避策の副作用 (機能低下) を確認した上で。 -
3Apply patch patch
Upgrade phpmailer/phpmailer to 6.1.6ステージング環境で 6.1.6 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。
-
4Post-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
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2020-13625 libphp-phpmailer Fixed in: 6.1.6-1
References
- advisory github.com
- advisory lists.debian.org
- advisory lists.debian.org
- advisory usn.ubuntu.com
- advisory github.com
- package github.com
- web lists.opensuse.org
- web lists.opensuse.org
- web lists.fedoraproject.org
- web lists.fedoraproject.org
- web nvd.nist.gov
- web github.com
- web lists.fedoraproject.org
- web lists.fedoraproject.org
- web usn.ubuntu.com