CVE-2025-55944: Slink v1.4.9 allows stored cross-site scripting (XSS) via crafted SVG uploads

Routine

MEDIUM 6.1DOWNGRADE

CVE-2025-55944 is a medium-severity flaw (CVSS 6.1) affecting slink. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Slink v1.4.9 allows stored cross-site scripting (XSS) via crafted SVG uploads. When a user views the shared image in a new browser tab, the embedded JavaScript executes. The issue affects both authenticated and unauthenticated users.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 81%)
CISA exploited list	No
Weakness	CWE-79
Published	2025-09-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: slinkapp

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-09-03 16:15 UTCPublished CVE record published
2026-06-17 09:42 UTCUpdated Record last modified

slinkapp slink DOWNGRADE

Affected: 1.4.9 · 1.5.1 · 1.6.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.4.9

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.4.9 (Debian / Ubuntu)

apt-cache madison slink sudo apt install slink=<VERSION_BEFORE_1.4.9> sudo apt-mark hold slink

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

dnf --showduplicates list slink sudo dnf downgrade slink-<VERSION_BEFORE_1.4.9> sudo dnf versionlock add slink

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-2025-55944?

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

Is CVE-2025-55944 being exploited?

CVE-2025-55944 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-2025-55944 affect?

CVE-2025-55944 affects slink. Severity is medium (CVSS 6.1). Slink v1.4.9 allows stored cross-site scripting (XSS) via crafted SVG uploads. When a user views the shared image in a new browser tab, the embedded JavaScript executes. The issue affects both authenticated and unauthenticated users.

How urgent is CVE-2025-55944?

Priority 31/100. Public exploit reference

References

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