CVE-2021-25278: FTAPI 4.0 through 4.10 allows XSS via an SVG document to the Background Image upload feature in the Submit Box

Routine

MEDIUM 4.8UPGRADE

CVE-2021-25278 is a medium-severity flaw (CVSS 4.8) affecting ftapi. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

FTAPI 4.0 through 4.10 allows XSS via an SVG document to the Background Image upload feature in the Submit Box Template Editor.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.6% (top 53%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-03-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ftapi

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

Am I affected?

Timeline

2021-03-19 17:15 UTCPublished CVE record published
2026-06-17 03:41 UTCUpdated Record last modified

ftapi ftapi UPGRADE

Affected: >= 4.0 and <= 4.10

Fixed in: newer than 4.10

Safe to downgrade to: a release before 4.0

1. Check installed version

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

2. UPGRADE to newer than 4.10 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ftapi

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 4.0 (Debian / Ubuntu)

apt-cache madison ftapi sudo apt install ftapi=<VERSION_BEFORE_4.0> sudo apt-mark hold ftapi

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

dnf --showduplicates list ftapi sudo dnf downgrade ftapi-<VERSION_BEFORE_4.0> sudo dnf versionlock add ftapi

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-2021-25278?

ftapi: upgrade to newer than 4.10. Exact commands for each OS are on this page.

Is CVE-2021-25278 being exploited?

CVE-2021-25278 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-2021-25278 affect?

CVE-2021-25278 affects ftapi. Severity is medium (CVSS 4.8). FTAPI 4.0 through 4.10 allows XSS via an SVG document to the Background Image upload feature in the Submit Box Template Editor.

How urgent is CVE-2021-25278?

Priority 28/100. No elevated risk signals yet.

Related CVEs

CVE-2021-25277 MEDIUM 6.1 UPGRADE FTAPI 4.0 - 4.10 allows XSS via a crafted filename to the alternative text hover box in the file submission co

References

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