How severe is CVE-2019-13956?

CVE-2019-13956 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-13956 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-13956?

CVE-2019-13956 affects Codersclub Discuz!ml. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-13956?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2019-13956 published?

CVE-2019-13956 was published on 2019-07-18 and last updated on 2026-06-17.

CVE-2019-13956

CVE-2019-13956 is a critical-severity vulnerability in Codersclub Discuz!ml with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-94.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 5% (90th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-94
Affected product: Codersclub Discuz!ml
Published: 2019-07-18
Last modified: 2026-06-17

Description

Discuz!ML 3.2 through 3.4 allows remote attackers to execute arbitrary PHP code via a modified language cookie, as demonstrated by changing 4gH4_0df5_language=en to 4gH4_0df5_language=en'.phpinfo().'; (if the random prefix 4gH4_0df5_ were used).

Frequently asked questions

What is CVE-2019-13956?: Discuz!ML 3.2 through 3.4 allows remote attackers to execute arbitrary PHP code via a modified language cookie, as demonstrated by changing 4gH4_0df5_language=en to 4gH4_0df5_language=en'.phpinfo().'; (if the random prefix 4gH4_0df5_ were used).
How severe is CVE-2019-13956?: CVE-2019-13956 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-13956 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-13956?: CVE-2019-13956 affects Codersclub Discuz!ml. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-13956?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2019-13956 published?: CVE-2019-13956 was published on 2019-07-18 and last updated on 2026-06-17.

References

http://esoln.net/esoln/blog/2019/06/14/discuzml-v-3-x-code-injection-vulnerability/

Affected products (1)

cpe:2.3:a:codersclub:discuz\!ml:*:*:*:*:*:*:*:*

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