CVE-2019-13949: SyGuestBook A5 Version 1.2 has no CSRF protection mechanism, as demonstrated by CSRF for an index.php?c=Admini

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HIGH 8.8DOWNGRADE

CVE-2019-13949 is a high-severity flaw (CVSS 8.8) affecting syguestbook a5. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SyGuestBook A5 Version 1.2 has no CSRF protection mechanism, as demonstrated by CSRF for an index.php?c=Administrator&a=update admin password change.

Why this priority

High severity
Public exploit reference

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	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-352
Published	2019-07-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: syguestbook a5 project

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

Am I affected?

Timeline

2019-07-18 16:15 UTCPublished CVE record published
2026-06-17 02:17 UTCUpdated Record last modified

syguestbook a5 project syguestbook a5 DOWNGRADE

Affected: 1.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.2

1. Check installed version

apt-cache policy syguestbook-a5 || rpm -q syguestbook-a5 || syguestbook-a5 --version

2. No fixed release: DOWNGRADE to a release before 1.2 (Debian / Ubuntu)

apt-cache madison syguestbook-a5 sudo apt install syguestbook-a5=<VERSION_BEFORE_1.2> sudo apt-mark hold syguestbook-a5

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

dnf --showduplicates list syguestbook-a5 sudo dnf downgrade syguestbook-a5-<VERSION_BEFORE_1.2> sudo dnf versionlock add syguestbook-a5

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-2019-13949?

syguestbook a5: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-13949 being exploited?

CVE-2019-13949 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-2019-13949 affect?

CVE-2019-13949 affects syguestbook a5. Severity is high (CVSS 8.8). SyGuestBook A5 Version 1.2 has no CSRF protection mechanism, as demonstrated by CSRF for an index.php?c=Administrator&a=update admin password change.

How urgent is CVE-2019-13949?

Priority 49/100. High severity; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2019-13950 MEDIUM 5.4 DOWNGRADE index.php?c=admin&a=index in SyGuestBook A5 Version 1.2 has stored XSS via a reply to a comment.
CVE-2019-13948 MEDIUM 5.4 DOWNGRADE SyGuestBook A5 Version 1.2 allows stored XSS because the isValidData function in include/functions.php does no

References

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