CVE-2025-3518: It technically possible for a user to upload a file to a conversation despite the file upload functionality be

Routine

MEDIUM 4.3UPGRADE

CVE-2025-3518 is a medium-severity flaw (CVSS 4.3) affecting spark. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

It technically possible for a user to upload a file to a conversation despite the file upload functionality being disabled. The file upload functionality can be enabled or disabled for specific use cases through configuration. In case the functionality is disabled for at least one use case, the system nevertheless allows files to be uploaded through direct API requests. During the upload file, interception and allowed file type rules are still a

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 84%)
CISA exploited list	No
Weakness	CWE-284
Published	2025-04-22
Last modified	2026-06-17

Publisher (CNA): Switzerland Government Common Vulnerability Program · Vendor: unblu

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

Am I affected?

Timeline

2025-04-22 09:15 UTCPublished CVE record published
2026-06-17 09:20 UTCUpdated Record last modified

unblu spark UPGRADE

Affected: >= 7.0.1 and < 7.54.1 · >= 8.0.1 and < 8.13.1

Fixed in: 7.54.1, 8.13.1

Safe to downgrade to: a release before 7.0.1

1. Check installed version

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

2. UPGRADE to 7.54.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade spark

Note

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

3. If no update is available yet, DOWNGRADE to a release before 7.0.1 (Debian / Ubuntu)

apt-cache madison spark sudo apt install spark=<VERSION_BEFORE_7.0.1> sudo apt-mark hold spark

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list spark sudo dnf downgrade spark-<VERSION_BEFORE_7.0.1> sudo dnf versionlock add spark

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-2025-3518?

spark: upgrade to 7.54.1, 8.13.1. Exact commands for each OS are on this page.

Is CVE-2025-3518 being exploited?

CVE-2025-3518 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-2025-3518 affect?

CVE-2025-3518 affects spark. Severity is medium (CVSS 4.3). It technically possible for a user to upload a file to a conversation despite the file upload functionality being disabled. The file upload functionality can be enabled or disabled for specific use cases through configuration. In case the

How urgent is CVE-2025-3518?

Priority 19/100. No elevated risk signals yet.

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References

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