How severe is CVE-2026-17543?

CVE-2026-17543 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-2026-17543 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-17543?

CVE-2026-17543 affects Php. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-17543?

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-2026-17543 published?

CVE-2026-17543 was published on 2026-07-30 and last updated on 2026-08-05.

CVE-2026-17543

CVE-2026-17543 is a critical-severity vulnerability in Php 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-89.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 8.1
EPSS exploit prediction: 0% (39th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-89
Affected product: Php
Published: 2026-07-30
Last modified: 2026-08-05

Description

Improper escaping of backslashes in attacker-provided parameters would allow for trivial SQL injection in PHP versions from 8.2.* before 8.2.33, from 8.3.* before 8.3.33, from 8.4.* before 8.4.24, and from 8.5.* before 8.5.9.

Frequently asked questions

What is CVE-2026-17543?: Improper escaping of backslashes in attacker-provided parameters would allow for trivial SQL injection in PHP versions from 8.2.* before 8.2.33, from 8.3.* before 8.3.33, from 8.4.* before 8.4.24, and from 8.5.* before 8.5.9.
How severe is CVE-2026-17543?: CVE-2026-17543 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-2026-17543 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-17543?: CVE-2026-17543 affects Php. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-17543?: 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-2026-17543 published?: CVE-2026-17543 was published on 2026-07-30 and last updated on 2026-08-05.

References

https://github.com/php/php-src/security/advisories/GHSA-7qpv-r5mr-78m4

Affected products (1)

cpe:2.3:a:php:php:*:*:*:*:*:*:*:*

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Threat intelligence

Threat-intel indicators referencing this CVE:

142.93.181.206 (ipv4-addr)
39.105.204.188 (ipv4-addr)
83.59.212.143 (ipv4-addr)
187.34.226.180 (ipv4-addr)
109.122.252.86 (ipv4-addr)
73.94.248.204 (ipv4-addr)
31.216.62.126 (ipv4-addr)
185.7.172.105 (ipv4-addr)