How severe is CVE-2026-26833?

CVE-2026-26833 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-2026-26833 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-26833?

CVE-2026-26833 affects Mmahrous Thumbler. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-26833?

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-2026-26833 have an EU (EUVD) identifier?

Yes. CVE-2026-26833 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-15463.

When was CVE-2026-26833 published?

CVE-2026-26833 was published on 2026-03-25 and last updated on 2026-06-17.

CVE-2026-26833

CVE-2026-26833 is a critical-severity vulnerability in Mmahrous Thumbler 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-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-15463
Weakness: CWE-78
Affected product: Mmahrous Thumbler
Published: 2026-03-25
Last modified: 2026-06-17

Description

thumbler through 1.1.2 allows OS command injection via the input, output, time, or size parameter in the thumbnail() function because user input is concatenated into a shell command string passed to child_process.exec() without proper sanitization or escaping.

Frequently asked questions

What is CVE-2026-26833?: thumbler through 1.1.2 allows OS command injection via the input, output, time, or size parameter in the thumbnail() function because user input is concatenated into a shell command string passed to child_process.exec() without proper sanitization or escaping.
How severe is CVE-2026-26833?: CVE-2026-26833 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-2026-26833 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-26833?: CVE-2026-26833 affects Mmahrous Thumbler. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-26833?: 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-2026-26833 have an EU (EUVD) identifier?: Yes. CVE-2026-26833 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-15463.
When was CVE-2026-26833 published?: CVE-2026-26833 was published on 2026-03-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:mmahrous:thumbler:*:*:*:*:*:node.js:*:*

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