CVE-2026-3837: An authenticated attacker can persist crafted values in multiple field types and trigger client-side script ex

Routine

MEDIUM 5.4DOWNGRADE

CVE-2026-3837 is a medium-severity flaw (CVSS 5.4) affecting frappe. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An authenticated attacker can persist crafted values in multiple field types and trigger client-side script execution when another user opens the affected document in Desk. The vulnerable formatter implementations interpolate stored values into raw HTML attributes and element content without escaping This issue affects Frappe: 16.10.0.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.2% (top 91%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-04-22
Last modified	2026-06-17

Publisher (CNA): Fluid Attacks · Vendor: frappe

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

Am I affected?

Timeline

2026-04-22 21:17 UTCPublished CVE record published
2026-06-17 10:44 UTCUpdated Record last modified

frappe frappe DOWNGRADE

Affected: 16.10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 16.10.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 16.10.0 (Debian / Ubuntu)

apt-cache madison frappe sudo apt install frappe=<VERSION_BEFORE_16.10.0> sudo apt-mark hold frappe

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

dnf --showduplicates list frappe sudo dnf downgrade frappe-<VERSION_BEFORE_16.10.0> sudo dnf versionlock add frappe

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-2026-3837?

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

Is CVE-2026-3837 being exploited?

CVE-2026-3837 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-2026-3837 affect?

CVE-2026-3837 affects frappe. Severity is medium (CVSS 5.4). An authenticated attacker can persist crafted values in multiple field types and trigger client-side script execution when another user opens the affected document in Desk. The vulnerable formatter implementations interpolate stored values

How urgent is CVE-2026-3837?

Priority 26/100. Public exploit reference

Related CVEs

CVE-2026-81731 MEDIUM 5.4 UPGRADE Frappe 15.11.0 through 16.32.0 stores and renders the workspace card description without XSS filtering
CVE-2026-3673 MEDIUM 5.4 DOWNGRADE An authenticated attacker can store a crafted tag value in _user_tags and trigger JavaScript execution when a

References

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