How severe is CVE-2026-23836?

CVE-2026-23836 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-23836 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-23836?

CVE-2026-23836 affects Hotcrp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-23836?

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.

Does CVE-2026-23836 have an EU (EUVD) identifier?

Yes. CVE-2026-23836 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3305.

When was CVE-2026-23836 published?

CVE-2026-23836 was published on 2026-01-19 and last updated on 2026-06-17.

CVE-2026-23836

CVE-2026-23836 is a critical-severity vulnerability in Hotcrp with a CVSS 3.x base score of 9.9. 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-20.

Key facts

Severity: Critical (CVSS 3.x base score 9.9)
EPSS exploit prediction: 0% (31st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-3305
Weakness: CWE-20
Affected product: Hotcrp
Published: 2026-01-19
Last modified: 2026-06-17

Description

HotCRP is conference review software. A problem introduced in April 2024 in version 3.1 led to inadequately sanitized code generation for HotCRP formulas which allowed users to trigger the execution of arbitrary PHP code. The problem is patched in release version 3.2.

Frequently asked questions

What is CVE-2026-23836?: HotCRP is conference review software. A problem introduced in April 2024 in version 3.1 led to inadequately sanitized code generation for HotCRP formulas which allowed users to trigger the execution of arbitrary PHP code. The problem is patched in release version 3.2.
How severe is CVE-2026-23836?: CVE-2026-23836 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-23836 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-23836?: CVE-2026-23836 affects Hotcrp. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-23836?: 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.
Does CVE-2026-23836 have an EU (EUVD) identifier?: Yes. CVE-2026-23836 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3305.
When was CVE-2026-23836 published?: CVE-2026-23836 was published on 2026-01-19 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:hotcrp:hotcrp:*:*:*:*:*:*:*:*

More vulnerabilities in Hotcrp

CVE-2026-25156 — High (CVSS 7.3): HotCRP is conference review software. HotCRP versions from October 2025 through January 2026 delivered documents of all…
CVE-2026-23878 — Medium (CVSS 6.5): HotCRP is conference review software. Starting in commit aa20ef288828b04550950cf67c831af8a525f508 and prior to commit…
CVE-2022-4819 — Low (CVSS 2.4): A vulnerability was found in HotCRP. It has been rated as problematic. Affected by this issue is some unknown…

All CVEs affecting Hotcrp →

Other CWE-20 (Improper Input Validation) vulnerabilities

CVE-2026-48316 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48281 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48277 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48055 — Critical (CVSS 10.0): Streambert is a cross-platform Electron Desktop App to stream and download any video media. In versions 2.4.0 and…
CVE-2026-34910 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS…
CVE-2026-33587 — Critical (CVSS 10.0): Lack of user input sanitisation in Open Notebook v1.8.3 allows the application user to execute Python code (and…

Browse all CWE-20 (Improper Input Validation) vulnerabilities →