# CVE-2026-28809: XXE in esaml SAML library allows local file read and potential SSRF

> CVE-2026-28809: XXE in esaml SAML library allows local file read and potential SSRF. CVSS 5.3 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-28809
Last updated: 2026-07-24T15:17:15Z

- Published: 2026-03-23 10:09 UTC · Updated: 2026-07-24 15:17 UTC · Assigner: EEF
- CVSS: 5.3 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- EPSS: 0.29%, 21th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-611

## Description

XML External Entity (XXE) vulnerability in esaml (and its forks) allows an attacker to cause the system to read local files and incorporate their contents into processed SAML documents, and potentially perform SSRF via crafted SAML messages. esaml parses attacker-controlled SAML messages using xmerl\_scan:string/2 before signature verification without disabling XML entity expansion. On Erlang/OTP versions before 27, Xmerl allows entities by default, enabling pre-signature XXE attacks. An attacker can cause the host to read local files (e.g., Kubernetes-mounted secrets) into the SAML document. If the attacker is not a trusted SAML SP, signature verification will fail and the document is discarded, but file contents may still be exposed through logs or error messages. This issue affects all versions of esaml, including forks by arekinath, handnot2, and dropbox. Users running on Erlang/OTP 27 or later are not affected due to Xmerl defaulting to entities disabled.

## Affected vendors and products

- arekinath: esaml
- dropbox: esaml
- handnot2: esaml
- Jump-App: esaml

## Tracked companies

- [Dropbox](https://rewindex.com/company/dropbox.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-28809)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-28809)
- [https://cna.erlef.org/cves/CVE-2026-28809.html](https://cna.erlef.org/cves/CVE-2026-28809.html)
- [https://github.com/Jump-App/esaml/commit/bab85efde7c136911402a881ca55173759467a26](https://github.com/Jump-App/esaml/commit/bab85efde7c136911402a881ca55173759467a26)
- [https://osv.dev/vulnerability/EEF-CVE-2026-28809](https://osv.dev/vulnerability/EEF-CVE-2026-28809)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-28809 · Markdown: https://rewindex.com/cve/CVE-2026-28809.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-28809 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:49:29.124Z