CVE-2026-28809: XML External Entity (XXE) vulnerability in esaml (and its forks) allows an attacker to cause the system to rea

Q: How do I fix CVE-2026-28809?

esaml: upgrade to newer than 1.1; esaml: mitigate or apply the listed mitigation; esaml: upgrade to newer than 4.2.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-28809 being exploited?

CVE-2026-28809 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-28809 affect?

CVE-2026-28809 affects esaml, esaml, esaml. Severity is medium (CVSS 5.3). 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

Q: How urgent is CVE-2026-28809?

Priority 29/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADEMITIGATEUPGRADE

CVE-2026-28809 is a medium-severity flaw (CVSS 5.3) affecting esaml, esaml, esaml. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 defau

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-611
Published	2026-03-23
Last modified	2026-07-24

Publisher (CNA): EEF · Vendor: arekinath · dropbox · handnot2 · jump-app

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-23 11:16 UTCPublished CVE record published
2026-07-24 15:17 UTCUpdated Record last modified

arekinath esaml UPGRADE

Affected: <= 1.1

Fixed in: newer than 1.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy esaml || rpm -q esaml || esaml --version

2. UPGRADE to newer than 1.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade esaml

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade esaml

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

dropbox esaml MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy esaml || rpm -q esaml || esaml --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

handnot2 esaml UPGRADE

Affected: <= 4.2.0

Fixed in: newer than 4.2.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy esaml || rpm -q esaml || esaml --version

2. UPGRADE to newer than 4.2.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade esaml

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade esaml

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

jump-app esaml UPGRADE

Affected: <= 4.6.0

Fixed in: newer than 4.6.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy esaml || rpm -q esaml || esaml --version

2. UPGRADE to newer than 4.6.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade esaml

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade esaml

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-28809?

esaml: upgrade to newer than 1.1; esaml: mitigate or apply the listed mitigation; esaml: upgrade to newer than 4.2.0. Exact commands for each OS are on this page.

Is CVE-2026-28809 being exploited?

CVE-2026-28809 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-28809 affect?

CVE-2026-28809 affects esaml, esaml, esaml. Severity is medium (CVSS 5.3). 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

How urgent is CVE-2026-28809?

Priority 29/100. Remotely exploitable, no login, no user action

Software pages

Dropbox vulnerabilities

References

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