CVE-2026-40039 | Pachno 1.0.6 return_to authentication bypass (ZSL-2026-5981)

VDB-357201 · CVE-2026-40039 · ZSL-2026-5981 PACHNO 1.0.6 RETURN_TO AUTHENTICATION BYPASS HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.3 $0-$5k 0.91+ Summaryinfo A vulnerability was found in Pachno 1.0.6. It has been classified as problematic. This impacts an unknown function. Performing a manipulation of the argument return_to results in authentication bypass. This vulnerability is identified as CVE-2026-40039. The attack can be initiated remotely. There is not any exploit available. Detailsinfo A vulnerability classified as problematic has been found in Pachno 1.0.6. This affects an unknown code block. The manipulation of the argument return_to with an unknown input leads to a authentication bypass vulnerability. CWE is classifying the issue as CWE-305. The authentication algorithm is sound, but the implemented mechanism can be bypassed as the result of a separate weakness that is primary to the authentication error. This is going to have an impact on confidentiality. The summary by CVE is: Pachno 1.0.6 contains an open redirection vulnerability that allows attackers to redirect users to arbitrary external websites by manipulating the return_to parameter. Attackers can craft malicious login URLs with unvalidated return_to values to conduct phishing attacks and steal user credentials. The weakness was released by Gjoko Krstic as ZSL-2026-5981. The advisory is shared at zeroscience.mk. This vulnerability is uniquely identified as CVE-2026-40039 since 04/08/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/13/2026). There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product. Productinfo Name Pachno Version 1.0.6 CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 5.4 VulDB Meta Temp Score: 5.3 VulDB Base Score: 4.3 VulDB Temp Score: 4.2 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 6.5 CNA Vector (VulnCheck): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Authentication bypass CWE: CWE-305 / CWE-287 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: no mitigation known Status: 🔍 0-Day Time: 🔒 Timelineinfo 04/08/2026 CVE reserved 04/13/2026 +5 days Advisory disclosed 04/13/2026 +0 days VulDB entry created 04/13/2026 +0 days VulDB entry last update Sourcesinfo Advisory: ZSL-2026-5981 Researcher: Gjoko Krstic Status: Not defined CVE: CVE-2026-40039 (🔒) GCVE (CVE): GCVE-0-2026-40039 GCVE (VulDB): GCVE-100-357201 Entryinfo Created: 04/13/2026 21:40 Changes: 04/13/2026 21:40 (74) Complete: 🔍 Cache ID: 99:409:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸