How severe is CVE-2026-34527?

CVE-2026-34527 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-34527 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34527?

CVE-2026-34527 affects Sandboxie-plus Sandboxie. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34527?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-34527 have an EU (EUVD) identifier?

Yes. CVE-2026-34527 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27466.

When was CVE-2026-34527 published?

CVE-2026-34527 was published on 2026-05-05 and last updated on 2026-06-17.

CVE-2026-34527

CVE-2026-34527 is a medium-severity vulnerability in Sandboxie-plus Sandboxie with a CVSS 3.x base score of 5.3. 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-328.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 2.0
EPSS exploit prediction: 0% (1st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-27466
Weakness: CWE-328
Affected product: Sandboxie-plus Sandboxie
Published: 2026-05-05
Last modified: 2026-06-17

Description

Sandboxie-Plus is an open source sandbox-based isolation software for Windows. In versions 1.17.2 and earlier, SbieIniServer::HashPassword converts a SHA-1 digest to hexadecimal incorrectly. The high nibble of each byte is shifted right by 8 instead of 4, which always produces zero for an 8-bit value. As a result, the stored EditPassword hash only preserves the low nibble of each digest byte, reducing the effective entropy from 160 bits to 80 bits. This is layered on top of an unsalted SHA-1 scheme. The reduced entropy makes leaked or backed-up password hashes materially easier to brute-force. This issue has been fixed in version 1.17.3.

Frequently asked questions

What is CVE-2026-34527?: Sandboxie-Plus is an open source sandbox-based isolation software for Windows. In versions 1.17.2 and earlier, SbieIniServer::HashPassword converts a SHA-1 digest to hexadecimal incorrectly. The high nibble of each byte is shifted right by 8 instead of 4, which always produces zero for an 8-bit value. As a result, the stored EditPassword hash only preserves the low nibble of each digest byte, reducing the effective entropy from 160 bits to 80 bits. This is layered on top of an unsalted SHA-1 scheme. The reduced entropy makes leaked or backed-up password hashes materially easier to brute-force. This issue has been fixed in version 1.17.3.
How severe is CVE-2026-34527?: CVE-2026-34527 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-34527 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34527?: CVE-2026-34527 affects Sandboxie-plus Sandboxie. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34527?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-34527 have an EU (EUVD) identifier?: Yes. CVE-2026-34527 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27466.
When was CVE-2026-34527 published?: CVE-2026-34527 was published on 2026-05-05 and last updated on 2026-06-17.

References

https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-w37h-qm9p-h4x2

Affected products (1)

cpe:2.3:a:sandboxie-plus:sandboxie:*:*:*:*:plus:*:*:*

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