CVE-2026-11944: openSIS Classic 9.3 contains an authenticated path traversal vulnerability in the legacy messaging sent-mail a

Routine

MEDIUM 6.5DOWNGRADE

CVE-2026-11944 is a medium-severity flaw (CVSS 6.5) affecting opensis. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

openSIS Classic 9.3 contains an authenticated path traversal vulnerability in the legacy messaging sent-mail attachment download functionality that allows an authenticated attacker to read arbitrary files on the server via crafted path traversal sequences.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-07-14
Last modified	2026-10-24

Publisher (CNA): Fluid Attacks · Vendor: os4ed

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-14 16:16 UTCPublished CVE record published
2026-10-24 21:10 UTCUpdated Record last modified

os4ed opensis DOWNGRADE

Affected: 9.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.3

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 9.3 (Debian / Ubuntu)

apt-cache madison opensis sudo apt install opensis=<VERSION_BEFORE_9.3> sudo apt-mark hold opensis

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list opensis sudo dnf downgrade opensis-<VERSION_BEFORE_9.3> sudo dnf versionlock add opensis

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-11944?

opensis: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-11944 being exploited?

CVE-2026-11944 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-2026-11944 affect?

CVE-2026-11944 affects opensis. Severity is medium (CVSS 6.5). openSIS Classic 9.3 contains an authenticated path traversal vulnerability in the legacy messaging sent-mail attachment download functionality that allows an authenticated attacker to read arbitrary files on the server via crafted path trav

How urgent is CVE-2026-11944?

Priority 38/100. Public exploit reference

References

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