CVE-2023-34839: A Cross Site Request Forgery (CSRF) vulnerability in Issabel issabel-pbx v.4.0.0-6 allows a remote attacker to

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MEDIUM 6.8DOWNGRADE

CVE-2023-34839 is a medium-severity flaw (CVSS 6.8) affecting pbx. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Cross Site Request Forgery (CSRF) vulnerability in Issabel issabel-pbx v.4.0.0-6 allows a remote attacker to gain privileges via a Custom CSRF exploit to create new user function in the application.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.8 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.7% (top 49%)
CISA exploited list	No
Weakness	CWE-352
Published	2023-06-27
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: issabel

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

Am I affected?

Timeline

2023-06-27 18:15 UTCPublished CVE record published
2026-06-17 06:04 UTCUpdated Record last modified

issabel pbx DOWNGRADE

Affected: 4.0.0-6

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0.0-6

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.0.0-6 (Debian / Ubuntu)

apt-cache madison pbx sudo apt install pbx=<VERSION_BEFORE_4.0.0-6> sudo apt-mark hold pbx

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

dnf --showduplicates list pbx sudo dnf downgrade pbx-<VERSION_BEFORE_4.0.0-6> sudo dnf versionlock add pbx

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-2023-34839?

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

Is CVE-2023-34839 being exploited?

CVE-2023-34839 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-2023-34839 affect?

CVE-2023-34839 affects pbx. Severity is medium (CVSS 6.8). A Cross Site Request Forgery (CSRF) vulnerability in Issabel issabel-pbx v.4.0.0-6 allows a remote attacker to gain privileges via a Custom CSRF exploit to create new user function in the application.

How urgent is CVE-2023-34839?

Priority 42/100. Public exploit reference

Related CVEs

CVE-2024-0986 MEDIUM 4.7 DOWNGRADE A vulnerability was found in Issabel PBX 4.0.0
CVE-2023-37599 HIGH 7.5 DOWNGRADE An issue in issabel-pbx v.4.0.0-6 allows a remote attacker to obtain sensitive information via the modules dir
CVE-2023-37598 MEDIUM 4.5 DOWNGRADE A Cross Site Request Forgery (CSRF) vulnerability in issabel-pbx v.4.0.0-6 allows a remote attacker to cause a
CVE-2023-37597 HIGH 8.1 DOWNGRADE Cross Site Request Forgery (CSRF) vulnerability in issabel-pbx v.4.0.0-6 allows a remote attacker to cause a d
CVE-2023-37596 HIGH 8.1 DOWNGRADE Cross Site Request Forgery (CSRF) vulnerability in issabel-pbx v.4.0.0-6 allows a remote attacker to cause a d

References

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