How severe is CVE-2026-8878?

CVE-2026-8878 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-8878 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-8878?

CVE-2026-8878 affects Securly. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-8878?

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

Does CVE-2026-8878 have an EU (EUVD) identifier?

Yes. CVE-2026-8878 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34163.

When was CVE-2026-8878 published?

CVE-2026-8878 was published on 2026-06-03 and last updated on 2026-06-17.

CVE-2026-8878

CVE-2026-8878 is a high-severity vulnerability in Securly with a CVSS 3.x base score of 7.5. 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-326.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (11th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-34163
Weakness: CWE-326
Affected product: Securly
Published: 2026-06-03
Last modified: 2026-06-17

Description

Version 3.0.7 of the Securly Chrome Extension exposes multiple publicly accessible endpoints that allow unauthenticated access to sensitive data. The exposed information consists of SHA-1 hashes that are inadequately obfuscated using a simple Caesar cipher, which can be easily reversed to recover the original hash values and access the protected data.

Frequently asked questions

What is CVE-2026-8878?: Version 3.0.7 of the Securly Chrome Extension exposes multiple publicly accessible endpoints that allow unauthenticated access to sensitive data. The exposed information consists of SHA-1 hashes that are inadequately obfuscated using a simple Caesar cipher, which can be easily reversed to recover the original hash values and access the protected data.
How severe is CVE-2026-8878?: CVE-2026-8878 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-8878 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-8878?: CVE-2026-8878 affects Securly. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-8878?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-8878 have an EU (EUVD) identifier?: Yes. CVE-2026-8878 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34163.
When was CVE-2026-8878 published?: CVE-2026-8878 was published on 2026-06-03 and last updated on 2026-06-17.

References

https://kb.cert.org/vuls/id/595768

Affected products (1)

cpe:2.3:a:securly:securly:3.0.7:*:*:*:*:chrome:*:*

More vulnerabilities in Securly

CVE-2026-8889 — High (CVSS 7.5): Version 3.0.7 of the Securly Chrome Extension uses deprecated SHA-1 hashing for IWF CSAM URL matching (25,020 hashes)…
CVE-2026-8888 — High (CVSS 7.5): Version 3.0.7 of the Securly Chrome Extension downloads config.json over HTTP and compiles server-provided patterns as…
CVE-2026-8881 — High (CVSS 7.5): Version 3.0.7 of the Securly Chrome Extension uses EVP_BytesToKey key derivation with MD5 and a single iteration for…
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CVE-2026-8876 — High (CVSS 7.3): Version 3.0.7 of the Securly Chrome Extension contains hardcoded, plaintext AES passphrases in securly.min.js. These…
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