How severe is CVE-2008-1393?

No CVSS score has been assigned to CVE-2008-1393 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2008-1393?

CVE-2008-1393 affects the following packages: plone (PyPI). Ecosystems affected: PyPI.

How do I fix CVE-2008-1393?

Update plone to 3.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2008-1393 is resolved across your whole dependency graph.

How do I detect CVE-2008-1393 in my PyPI dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for plone, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2008-1393 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is CVE-2008-1393 actively exploited in the wild?

Yes. There are 2 known exploit references for CVE-2008-1393, including 2 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2008-1393?

CVE-2008-1393 has an EPSS (Exploit Prediction Scoring System) score of 2.9%, placing it in the 87th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2008-1393?

CVE-2008-1393 is classified as CWE-255 (CWE-255). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2008-1393 published, and has it been updated?

CVE-2008-1393 was published on May 1, 2022 and was last updated on July 6, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐍 PyPI

Not in CISA KEV

CVE-2008-1393 — plone

CVE-2008-1393 is a CWE-255 vulnerability in plone. 2 public exploit or proof-of-concept references are indexed, so weaponization risk is real. A fix is available for plone — see the affected versions and patch details below.

Plone Improper Session Management

Also known asPYSEC-2026-731

Published

May 1, 2022

Updated

Jul 6, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

2 known

Exploitation data as of Nov 3, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

2.9%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs87th percentile — riskier than 87% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

1 pkg affected

🐍plone

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

Plone CMS 3.0.5, and probably other 3.x versions, places a base64 encoded form of the username and password in the __ac cookie for the admin account, which makes it easier for remote attackers to obtain administrative privileges by sniffing the network.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐍PyPI	`plone`	all versions	3.0`pip install --upgrade 'plone==3.0'`

Affected Products

1 product · 2 configurations

Application

plone cmsplone

≤ 3.0.5

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Plone CMS 3.0.5, and probably other 3.x versions, places a base64 encode…

plone.orgNVDOct 2018

Report on plone.org

plone.orgNVDOct 2018

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for plone, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update plone to 3.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2008-1393 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

Plone CMS before 3, places a base64 encoded form of the username and password in the `__ac` cookie for the admin account, which makes it easier for remote attackers to obtain administrative privileges by sniffing the network.

O3 Security · Impact-Aware SCA

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