VulnerabilityPublished 1 Dec 2023Updated 3 Jun 2025

CVE-2023-5635: ArslanSoft Education Portal · Improper Protection for Outbound Error Messages and Alert Signals

Affects ArslanSoft Education PortalSource CVE Database V5

Not known to be exploited · CVSS 7.5 High : upgrade to 1.1 soon.

Data as of 26 Oct 2026, 17:16 UTC

CVSS 3.1 base score

7.5High

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.5% chance of exploitation in 30 days – higher than 48% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 1.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: None
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 1 Dec 2023
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade ArslanSoft Education Portal to 1.1.

Affected software

Product	Affected	Fixed in
ArslanSoft Education Portal	Affected <1.1	Fixed in 1.1

AI-suggested

To mitigate CVE-2023-5635 effectively, European organizations should take the following specific actions: 1) Upgrade the ArslanSoft Education Portal to version 1.1 or later, where the vulnerability has been addressed. If an upgrade is not immediately feasible, implement application-layer filtering to sanitize or suppress detailed error messages that reveal account existence or other sensitive information. 2) Employ Web Application Firewalls (WAFs) configured to detect and block suspicious enumeration patterns or abnormal error message requests targeting the portal. 3) Conduct thorough logging and monitoring of authentication-related error messages and access attempts to identify potential reconnaissance activities early. 4) Enforce strong account lockout policies and multi-factor authentication (MFA) to reduce the risk of successful exploitation following account enumeration. 5) Engage with the vendor for official patches or guidance and validate the effectiveness of applied fixes through penetration testing focused on error message handling. 6) Educate administrative and security teams about this vulnerability to ensure rapid detection and response to exploitation attempts.

Description

Improper Protection for Outbound Error Messages and Alert Signals vulnerability in ArslanSoft Education Portal allows Account Footprinting.This issue affects Education Portal: before v1.1.

Impact

For European organizations, the impact of CVE-2023-5635 can be substantial, especially for educational institutions and entities relying on the ArslanSoft Education Portal for managing student, faculty, or administrative accounts. The exposure of account information through error messages compromises confidentiality, potentially leading to unauthorized access attempts, targeted phishing campaigns, and broader identity-based attacks. This can result in data breaches involving personal and academic information, damaging institutional reputation and violating data protection regulations such as the GDPR. Moreover, the ease of exploitation without authentication or user interaction increases the risk of automated scanning and mass enumeration attacks, which can overwhelm incident response capabilities. The vulnerability does not directly affect system integrity or availability, but the downstream effects of compromised accounts could lead to unauthorized data modifications or service disruptions. Given the critical role of education portals in managing sensitive data and access controls, European organizations must prioritize addressing this vulnerability to maintain compliance and protect stakeholder information.

CWE-1320Improper Protection for Outbound Error Messages and Alert Signals (opens in a new tab)
Base weakness
Untrusted agents can disable alerts about signal conditions exceeding limits or the response mechanism that handles such alerts.
Architecture and Design
Alert signals generated by critical events should be protected from access by untrusted agents. Only hardware or trusted firmware modules should be able to alter the alert configuration.
OWASP Cheat Sheets
Docker Security (opens in a new tab)
Third Party Javascript Management (opens in a new tab)
Virtual Patching (opens in a new tab)
OWASP ASVS 4.0.3
V1.4.4 (opens in a new tab)
V1.4.5 (opens in a new tab)
V1.10.1 (opens in a new tab)
Attack patterns
Accessing Functionality Not Properly Constrained by ACLs (opens in a new tab)
Exploiting Incorrectly Configured Access Control Security Levels (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

usom.gov.tr/bildirim/tr-23-0670 (opens in a new tab)

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 3 Jul 2025, 18:12 UTC

WeaknessesCWE-1320

Technical details

References

Community reviews