CVE-2026-29839: DedeCMS v5.7.118 was discovered to contain a Cross-Site Request Forgery (CSRF) vulnerability in /sys_task_add.

Routine

HIGH 8.8DOWNGRADE

CVE-2026-29839 is a high-severity flaw (CVSS 8.8) affecting dedecms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

DedeCMS v5.7.118 was discovered to contain a Cross-Site Request Forgery (CSRF) vulnerability in /sys_task_add.php.

Why this priority

High severity

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

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.1% (top 96%)
CISA exploited list	No
Weakness	CWE-352
Published	2026-03-24
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: dedecms

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

Am I affected?

Timeline

2026-03-24 16:16 UTCPublished CVE record published
2026-06-17 10:29 UTCUpdated Record last modified

dedecms dedecms DOWNGRADE

Affected: 5.7.118

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.7.118

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.7.118 (Debian / Ubuntu)

apt-cache madison dedecms sudo apt install dedecms=<VERSION_BEFORE_5.7.118> sudo apt-mark hold dedecms

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

dnf --showduplicates list dedecms sudo dnf downgrade dedecms-<VERSION_BEFORE_5.7.118> sudo dnf versionlock add dedecms

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-2026-29839?

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

Is CVE-2026-29839 being exploited?

CVE-2026-29839 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-2026-29839 affect?

CVE-2026-29839 affects dedecms. Severity is high (CVSS 8.8). DedeCMS v5.7.118 was discovered to contain a Cross-Site Request Forgery (CSRF) vulnerability in /sys_task_add.php.

How urgent is CVE-2026-29839?

Priority 32/100. High severity

Software pages

PHP vulnerabilities

Related CVEs

CVE-2024-30855 HIGH 8.8 DOWNGRADE DedeCMS v5.7 was discovered to contain a Cross-Site Request Forgery (CSRF) vulnerability via /src/dede/makehtm
CVE-2026-30694 CRITICAL 9.8 UPGRADE An issue in DedeCMS v.5.7.118 and before allows a remote attacker to execute arbitrary code via the array_filt
CVE-2026-30643 CRITICAL 9.8 UPGRADE An issue was discovered in DedeCMS 5.7.118 allowing attackers to execute code via crafted setup tag values in

References

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