CVE-2026-28809XXE in esaml SAML library allows local file read and potential SSRF
Updated under an hour ago ()
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It affects dropbox esaml and 3 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 6.3 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- Weakness (CWE)
- CWE-611
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- EEF
- NVD analysis
- Modified
- Record last updated
- Jul 24, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
dropbox esaml dropbox:esaml | All versions | CNA record |
dropbox esaml arekinath:esaml | All versions | CNA record |
dropbox esaml handnot2:esaml | All versions | CNA record |
Jump-App esaml jump-app:esaml | from deeb84378d5c82153b470e99d24f77c38afca14a before bab85efde7c136911402a881ca55173759467a26; bab85efde7c136911402a881ca55173759467a26 not affected | CNA record |
arekinath esaml arekinath:esaml | through 1.1 | NVD |
dropbox esaml dropbox:esaml | all versions | NVD |
handnot2 esaml handnot2:esaml | through 4.2.0 | NVD |
jump-app esaml jump-app:esaml | through 4.6.0 | NVD |
References
- https://cna.erlef.org/cves/CVE-2026-28809.htmlthird-party-advisory, related, patch
- https://osv.dev/vulnerability/EEF-CVE-2026-28809related, third-party-advisory
- https://github.com/Jump-App/esaml/commit/bab85efde7c136911402a881ca55173759467a26patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.